setup: fix safe.directory key not being checked

It seems that nothing is ever checking to make sure the safe directories
in the configs actually have the key safe.directory, so some unrelated
config that has a value with a certain directory would also make it a
safe directory.

Signed-off-by: Matheus Valadares <me@m28.io>
Signed-off-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

setup.c

@@ -1034,6 +1034,9 @@ static int safe_directory_cb(const char *key, const char *value, void *d)
 {
 	struct safe_directory_data *data = d;
 
+	if (strcmp(key, "safe.directory"))
+		return 0;
+
 	if (!value || !*value)
 		data->is_safe = 0;
 	else {

t/t0033-safe-directory.sh

@@ -21,6 +21,11 @@ test_expect_success 'safe.directory does not match' '
 	expect_rejected_dir
 '
 
+test_expect_success 'path exist as different key' '
+	git config --global foo.bar "$(pwd)" &&
+	expect_rejected_dir
+'
+
 test_expect_success 'safe.directory matches' '
 	git config --global --add safe.directory "$(pwd)" &&
 	git status