submodule: git submodule dup guard statement has been fixed.

d6f57b9c · Dmitry Lobanov · 49f9941d · d6f57b9c
Commit d6f57b9c authored May 19, 2021 by Dmitry Lobanov
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src/submodule.c
+1 -1

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--- a/src/submodule.c
+++ b/src/submodule.c
@@ -1857,7 +1857,7 @@ static void submodule_release(git_submodule *sm)
 git_submodule* git_submodule_dup(git_submodule *sm)
 {
 	if (!sm)
-		return;
+		return NULL;
 	GIT_REFCOUNT_INC(sm);
 	return sm;
 }