check_branch_commit(): make first parameter const

Make it clear that this function does not overwrite its first
argument.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/builtin/branch.c b/builtin/branch.c
index b42e5b6dbc76016ca18e5ddd7ded2af613013eb7..47e3eb92235a0bd0ef1b248eabca8ef0c0da51a0 100644 (file)
--- a/builtin/branch.c
+++ b/builtin/branch.c
@@ -160,7 +160,7 @@ static int branch_merged(int kind, const char *name,
 }
 
 static int check_branch_commit(const char *branchname, const char *refname,
-                              unsigned char *sha1, struct commit *head_rev,
+                              const unsigned char *sha1, struct commit *head_rev,
                               int kinds, int force)
 {
        struct commit *rev = lookup_commit_reference(sha1);