tag: set validity to 0 by defaultethomson/tag_valid

`git_tag_name_is_valid` needs to set validity to 0 when it
short-circuits.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/tag.c b/src/tag.c
index 7a155147d..837658a19 100644
--- a/src/tag.c
+++ b/src/tag.c
@@ -539,6 +539,8 @@ int git_tag_name_is_valid(int *valid, const char *name)
 
 	GIT_ASSERT(valid);
 
+	*valid = 0;
+
 	/*
 	 * Discourage tag name starting with dash,
 	 * https://github.com/git/git/commit/4f0accd638b8d2