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, 15 insertions, 0 deletions

diff --git a/coccinelle/free_and_replace.cocci b/coccinelle/free_and_replace.cocci
new file mode 100644
index 0000000000..9dcdbf4d42
--- /dev/null
+++ b/coccinelle/free_and_replace.cocci
@@ -0,0 +1,15 @@
+@@
+expression p, q;
+@@
+- free(p);
+- p = q;
+- q = NULL;
+- return 0;
++ return free_and_replace(p, q);
+@@
+expression p, q;
+@@
+- free(p);
+- p = q;
+- q = NULL;
++ free_and_replace(p, q);