read_raw_ref(): change flags parameter to unsigned int

read_raw_ref() is going to be part of the vtable for reference backends,
so clean up its interface to use "unsigned int flags" rather than "int
flags". Its caller still uses signed int for its flags arguments. But
changing that would touch a lot of code, so leave it for now.

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

refs/files-backend.c

@@ -1372,7 +1372,7 @@ static struct ref_entry *get_packed_ref(const char *refname)
  */
 static int resolve_missing_loose_ref(const char *refname,
 				     unsigned char *sha1,
-				     int *flags)
+				     unsigned int *flags)
 {
 	struct ref_entry *entry;
 
@@ -1421,7 +1421,7 @@ static int resolve_missing_loose_ref(const char *refname,
  *   refname will still be valid and unchanged.
  */
 static int read_raw_ref(const char *refname, unsigned char *sha1,
-			struct strbuf *symref, int *flags)
+			struct strbuf *symref, unsigned int *flags)
 {
 	struct strbuf sb_contents = STRBUF_INIT;
 	struct strbuf sb_path = STRBUF_INIT;
@@ -1570,7 +1570,7 @@ const char *resolve_ref_unsafe(const char *refname, int resolve_flags,
 	}
 
 	for (symref_count = 0; symref_count < MAXDEPTH; symref_count++) {
-		int read_flags = 0;
+		unsigned int read_flags = 0;
 
 		if (read_raw_ref(refname, sha1, &sb_refname, &read_flags)) {
 			*flags |= read_flags;