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, 2 insertions, 8 deletions

diff --git a/src/core/load-fragment.c b/src/core/load-fragment.c
index 06c156a623..8cc7a8e765 100644
--- a/src/core/load-fragment.c
+++ b/src/core/load-fragment.c
@@ -1591,11 +1591,7 @@ int config_parse_fdname(
                 return 0;
         }
 
-        free(s->fdname);
-        s->fdname = p;
-        p = NULL;
-
-        return 0;
+        return free_and_replace(s->fdname, p);
 }
 
 int config_parse_service_sockets(
@@ -2052,9 +2048,7 @@ int config_parse_working_directory(
                         return 0;
                 }
 
-                free(c->working_directory);
-                c->working_directory = k;
-                k = NULL;
+                free_and_replace(c->working_directory, k);
 
                 c->working_directory_home = false;
         }