Revert "Revert "coredumpctl: in case of error free pattern after print""

In the case of the error set_consume will free the pointer 'pattern'
which is later used in log_error. Either we should stop priniting that
or use simple set_put and free pattern manually.

This reverts commit ece6b8fd5b.

src/journal/coredumpctl.c

@@ -126,10 +126,11 @@ static int add_match(Set *set, const char *match) {
                 goto fail;
 
         log_debug("Adding pattern: %s", pattern);
-        r = set_consume(set, pattern);
+        r = set_put(set, pattern);
         if (r < 0) {
                 log_error("Failed to add pattern '%s': %s",
                           pattern, strerror(-r));
+                free(pattern);
                 goto fail;
         }