treewide: a few more log_*_errno + return simplifications

The one in tmpfiles.c:create_item() even looks like it fixes a bug.

src/libsystemd/sd-rtnl/rtnl-util.c

@@ -157,11 +157,9 @@ bool rtnl_message_type_is_addr(uint16_t type) {
 }
 
 int rtnl_log_parse_error(int r) {
-        log_error_errno(r, "Failed to parse netlink message: %m");
-        return r;
+        return log_error_errno(r, "Failed to parse netlink message: %m");
 }
 
 int rtnl_log_create_error(int r) {
-        log_error_errno(r, "Failed to create netlink message: %m");
-        return r;
+        return log_error_errno(r, "Failed to create netlink message: %m");
 }

src/machine/machine.c

@@ -259,8 +259,7 @@ int machine_load(Machine *m) {
                 if (r == -ENOENT)
                         return 0;
 
-                log_error_errno(r, "Failed to read %s: %m", m->state_file);
-                return r;
+                return log_error_errno(r, "Failed to read %s: %m", m->state_file);
         }
 
         if (id)

src/modules-load/modules-load.c

@@ -139,8 +139,7 @@ static int apply_file(struct kmod_ctx *ctx, const char *path, bool ignore_enoent
                 if (ignore_enoent && r == -ENOENT)
                         return 0;
 
-                log_error_errno(r, "Failed to open %s, ignoring: %m", path);
-                return r;
+                return log_error_errno(r, "Failed to open %s, ignoring: %m", path);
         }
 
         log_debug("apply: %s", path);

src/resolve/resolved-manager.c

@@ -379,10 +379,8 @@ static int manager_watch_hostname(Manager *m) {
                 if (r == -EPERM)
                         /* kernels prior to 3.2 don't support polling this file. Ignore the failure. */
                         m->hostname_fd = safe_close(m->hostname_fd);
-                else {
-                        log_error_errno(r, "Failed to add hostname event source: %m");
-                        return r;
-                }
+                else
+                        return log_error_errno(r, "Failed to add hostname event source: %m");
         }
 
         r = determine_hostname(&m->hostname);

src/shared/logs-show.c

@@ -858,8 +858,7 @@ static int output_cat(
                 if (r == -ENOENT)
                         return 0;
 
-                log_error_errno(r, "Failed to get data: %m");
-                return r;
+                return log_error_errno(r, "Failed to get data: %m");
         }
 
         assert(l >= 8);

src/sysctl/sysctl.c

@@ -134,8 +134,7 @@ static int parse_file(Hashmap *sysctl_options, const char *path, bool ignore_eno
                 if (ignore_enoent && r == -ENOENT)
                         return 0;
 
-                log_error_errno(r, "Failed to open file '%s', ignoring: %m", path);
-                return r;
+                return log_error_errno(r, "Failed to open file '%s', ignoring: %m", path);
         }
 
         log_debug("parse: %s", path);

src/sysusers/sysusers.c

@@ -1709,8 +1709,7 @@ static int read_config_file(const char *fn, bool ignore_enoent) {
                         if (ignore_enoent && r == -ENOENT)
                                 return 0;
 
-                        log_error_errno(r, "Failed to open '%s', ignoring: %m", fn);
-                        return r;
+                        return log_error_errno(r, "Failed to open '%s', ignoring: %m", fn);
                 }
 
                 f = rf;

src/tmpfiles/tmpfiles.c

@@ -667,10 +667,8 @@ static int create_item(Item *i) {
                 if (r < 0) {
                         struct stat a, b;
 
-                        if (r != -EEXIST) {
-                                log_error_errno(r, "Failed to copy files to %s: %m", i->path);
-                                return -r;
-                        }
+                        if (r != -EEXIST)
+                                return log_error_errno(r, "Failed to copy files to %s: %m", i->path);
 
                         if (stat(i->argument, &a) < 0) {
                                 log_error("stat(%s) failed: %m", i->argument);
@@ -1519,8 +1517,7 @@ static int read_config_file(const char *fn, bool ignore_enoent) {
                 if (ignore_enoent && r == -ENOENT)
                         return 0;
 
-                log_error_errno(r, "Failed to open '%s', ignoring: %m", fn);
-                return r;
+                return log_error_errno(r, "Failed to open '%s', ignoring: %m", fn);
         }
 
         FOREACH_LINE(line, f, break) {