Replace some calls to die(usage_str) with usage(usage_str).

The only change in behaviour should be having a "usage: " prefix
on the output string rather than "fatal: ", and an exit code of
129 rather than 128.

Signed-off-by: Ramsay Allan Jones <ramsay@ramsay1.demon.co.uk>
Signed-off-by: Junio C Hamano <junkio@cox.net>

builtin-add.c

@@ -117,7 +117,7 @@ int cmd_add(int argc, const char **argv, const char *prefix)
 			verbose = 1;
 			continue;
 		}
-		die(builtin_add_usage);
+		usage(builtin_add_usage);
 	}
 	pathspec = get_pathspec(prefix, argv + i);
 

builtin-init-db.c

@@ -267,7 +267,7 @@ int cmd_init_db(int argc, const char **argv, const char *prefix)
 		else if (!strncmp(arg, "--shared=", 9))
 			shared_repository = git_config_perm("arg", arg+9);
 		else
-			die(init_db_usage);
+			usage(init_db_usage);
 	}
 
 	/*

builtin-rm.c

@@ -80,7 +80,7 @@ int cmd_rm(int argc, const char **argv, const char *prefix)
 			force = 1;
 			continue;
 		}
-		die(builtin_rm_usage);
+		usage(builtin_rm_usage);
 	}
 	if (argc <= i)
 		usage(builtin_rm_usage);

builtin-write-tree.c

@@ -73,7 +73,7 @@ int cmd_write_tree(int argc, const char **argv, const char *unused_prefix)
 		else if (!strncmp(arg, "--prefix=", 9))
 			prefix = arg + 9;
 		else
-			die(write_tree_usage);
+			usage(write_tree_usage);
 		argc--; argv++;
 	}
 

hash-object.c

@@ -46,7 +46,7 @@ int main(int argc, char **argv)
 		if (!no_more_flags && argv[i][0] == '-') {
 			if (!strcmp(argv[i], "-t")) {
 				if (argc <= ++i)
-					die(hash_object_usage);
+					usage(hash_object_usage);
 				type = argv[i];
 			}
 			else if (!strcmp(argv[i], "-w")) {
@@ -66,8 +66,8 @@ int main(int argc, char **argv)
 				hash_stdin(type, write_object);
 			}
 			else
-				die(hash_object_usage);
-		} 
+				usage(hash_object_usage);
+		}
 		else {
 			const char *arg = argv[i];
 			if (0 <= prefix_length)