Let's fix a leak we have in check_tracking_branch() since the function
was introduced in 41c21f22d0 (branch.c: Validate tracking branches with
refspecs instead of refs/remotes/*, 2013-04-21).

The leak can be reviewed with:

   $ git remote add local .
   $ git update-ref refs/remotes/local/foo HEAD
   $ git branch --track bar local/foo

   Direct leak of 24 byte(s) in 1 object(s) allocated from:
       ... in xrealloc wrapper.c
       ... in strbuf_grow strbuf.c
       ... in strbuf_add strbuf.c
       ... in match_name_with_pattern remote.c
       ... in query_refspecs remote.c
       ... in remote_find_tracking remote.c
       ... in check_tracking_branch branch.c
       ... in for_each_remote remote.c
       ... in validate_remote_tracking_branch branch.c
       ... in dwim_branch_start branch.c
       ... in create_branch branch.c
       ... in cmd_branch builtin/branch.c
       ... in run_builtin git.c

Signed-off-by: Rubén Justo <redacted>
---
 branch.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/branch.c b/branch.c
index 19d606d360..09b9563ae7 100644
--- a/branch.c
+++ b/branch.c

@@ -480,9 +480,12 @@ static int check_tracking_branch(struct remote *remote, void *cb_data)
 {
 	char *tracking_branch = cb_data;
 	struct refspec_item query;
+	int res;
 	memset(&query, 0, sizeof(struct refspec_item));
 	query.dst = tracking_branch;
-	return !remote_find_tracking(remote, &query);
+	res = !remote_find_tracking(remote, &query);
+	free(query.src);
+	return res;
 }
 
 static int validate_remote_tracking_branch(char *ref)

-- 
2.40.1