fix -Wmaybe-uninitialized with -Og

When building with -Og on gcc 15.1.1, the build produces two warnings.
Even though in practice, these codepaths can't actually be hit while the
variables are uninitialized, satisfy the compiler by initializing the
variables.

This also acts as defensive programming since these codepaths are a
little bit spaghetti. If someone in the future makes a mistake and
causes the branch with the uninitialized variable to be hit, at least we
won't experience undefined behaviour.

Signed-off-by: Denton Liu <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: Denton-L

builtin/remote.c

@@ -1446,7 +1446,7 @@ static int set_head(int argc, const char **argv, const char *prefix,
 		b_local_head = STRBUF_INIT;
 	char *head_name = NULL;
 	struct ref_store *refs = get_main_ref_store(the_repository);
-	struct remote *remote;
+	struct remote *remote = NULL;
 
 	struct option options[] = {
 		OPT_BOOL('a', "auto", &opt_a,

t/unit-tests/clar/clar.c

@@ -350,7 +350,7 @@ static void
 clar_run_suite(const struct clar_suite *suite, const char *filter)
 {
 	const struct clar_func *test = suite->tests;
-	size_t i, matchlen;
+	size_t i, matchlen = 0;
 	struct clar_report *report;
 	int exact = 0;