cmd_fetch_pack(): handle non-option arguments outside of the loop

This makes it more obvious that the code is always executed unless
there is an error, and that the first initialization of nr_heads is
unnecessary.

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

builtin/fetch-pack.c

@@ -909,7 +909,6 @@ int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
 
 	packet_trace_identity("fetch-pack");
 
-	nr_heads = 0;
 	heads = NULL;
 	for (i = 1; i < argc; i++) {
 		const char *arg = argv[i];
@@ -971,14 +970,17 @@ int cmd_fetch_pack(int argc, const char **argv, const char *prefix)
 			}
 			usage(fetch_pack_usage);
 		}
-		dest = arg;
-		heads = (char **)(argv + i + 1);
-		nr_heads = argc - i - 1;
 		break;
 	}
-	if (!dest)
+
+	if (i < argc)
+		dest = argv[i++];
+	else
 		usage(fetch_pack_usage);
 
+	heads = (char **)(argv + i);
+	nr_heads = argc - i;
+
 	if (args.stdin_refs) {
 		/*
 		 * Copy refs from cmdline to new growable list, then