tree-wide: introduce free_and_replace helper

It's a common pattern, so add a helper for it. A macro is necessary
because a function that takes a pointer to a pointer would be type specific,
similarly to cleanup functions. Seems better to use a macro.

1 files changed, 1 insertions, 3 deletions

diff --git a/src/basic/path-util.c b/src/basic/path-util.c
index a76963aa9f..0f5b20cf05 100644
--- a/src/basic/path-util.c
+++ b/src/basic/path-util.c
@@ -288,9 +288,7 @@ char **path_strv_resolve(char **l, const char *prefix) {
                         } else {
                                 /* canonicalized path goes outside of
                                  * prefix, keep the original path instead */
-                                free(u);
-                                u = orig;
-                                orig = NULL;
+                                free_and_replace(u, orig);
                         }
                 } else
                         free(t);