tree-wide: introduce mfree()

Pretty trivial helper which wraps free() but returns NULL, so we can
simplify this:
        free(foobar);
        foobar = NULL;
to this:
        foobar = mfree(foobar);

1 files changed, 2 insertions, 4 deletions

diff --git a/src/bus-proxyd/bus-xml-policy.c b/src/bus-proxyd/bus-xml-policy.c
index dab5acbcb4..9a3b451c56 100644
--- a/src/bus-proxyd/bus-xml-policy.c
+++ b/src/bus-proxyd/bus-xml-policy.c
@@ -586,10 +586,8 @@ static int file_load(Policy *p, const char *path) {
                                 case POLICY_ITEM_SEND:
                                 case POLICY_ITEM_RECV:
 
-                                        if (streq(name, "*")) {
-                                                free(name);
-                                                name = NULL;
-                                        }
+                                        if (streq(name, "*"))
+                                                name = mfree(name);
                                         break;