checkout: call a single commit "it" intead of "them"

diff --git a/shallow.c b/shallow.c
index 04ea816e0e8f2ed2829ed4ceca8d031a867e2cda..d8bf40ad4bed3bc846bb71945f1c2bfce76a202d 100644 (file)
--- a/shallow.c
+++ b/shallow.c
@@ -22,7 +22,7 @@ void set_alternate_shallow_file(const char *path, int override)
        if (alternate_shallow_file && !override)
                return;
        free(alternate_shallow_file);
-       alternate_shallow_file = path ? xstrdup(path) : NULL;
+       alternate_shallow_file = xstrdup_or_null(path);
 }
 
 int register_shallow(const unsigned char *sha1)