log: print a test line whever we manage to open a log device

log.c

@@ -61,6 +61,8 @@ int log_open_kmsg(void) {
         if ((kmsg_fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0)
                 return -errno;
 
+        log_info("Succesfully opened /dev/kmsg for logging.");
+
         return 0;
 }
 
@@ -110,6 +112,8 @@ int log_open_syslog(void) {
                 return -errno;
         }
 
+        log_info("Succesfully opened syslog for logging.");
+
         return 0;
 }