push: further clean up fields of "struct ref"

The "nonfastforward" and "update" fields are only used while
deciding what value to assign to the "status" locally in a single
function.  Remove them from the "struct ref".

The "requires_force" field is not used to decide if the proposed
update requires a --force option to succeed, or to record such a
decision made elsewhere.  It is used by status reporting code that
the particular update was "forced".  Rename it to "forced_update",
and move the code to assign to it around to further clarify how it
is used and what it is used for.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

cache.h

@@ -1001,10 +1001,8 @@ struct ref {
 	char *symref;
 	unsigned int
 		force:1,
-		requires_force:1,
+		forced_update:1,
 		merge:1,
-		nonfastforward:1,
-		update:1,
 		deletion:1;
 	enum {
 		REF_STATUS_NONE = 0,

remote.c

@@ -1317,27 +1317,23 @@ void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
 		 *     passing the --force argument
 		 */
 
-		ref->update =
-			!ref->deletion &&
-			!is_null_sha1(ref->old_sha1);
-
-		if (ref->update) {
-			ref->nonfastforward =
+		if (!ref->deletion && !is_null_sha1(ref->old_sha1)) {
+			int nonfastforward =
 				!has_sha1_file(ref->old_sha1)
-				  || !ref_newer(ref->new_sha1, ref->old_sha1);
+				|| !ref_newer(ref->new_sha1, ref->old_sha1);
 
 			if (!prefixcmp(ref->name, "refs/tags/")) {
-				ref->requires_force = 1;
 				if (!force_ref_update) {
 					ref->status = REF_STATUS_REJECT_ALREADY_EXISTS;
 					continue;
 				}
-			} else if (ref->nonfastforward) {
-				ref->requires_force = 1;
+				ref->forced_update = 1;
+			} else if (nonfastforward) {
 				if (!force_ref_update) {
 					ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
 					continue;
 				}
+				ref->forced_update = 1;
 			}
 		}
 	}

transport.c

@@ -659,7 +659,7 @@ static void print_ok_ref_status(struct ref *ref, int porcelain)
 		const char *msg;
 
 		strcpy(quickref, status_abbrev(ref->old_sha1));
-		if (ref->requires_force) {
+		if (ref->forced_update) {
 			strcat(quickref, "...");
 			type = '+';
 			msg = "forced update";