Convert cmd_usage() calls in common to use a return value

Change all files in common/ to use CMD_RET_USAGE instead of calling
cmd_usage() directly. I'm not completely sure about this patch since
the code since impact is small (100 byte or so on ARM) and it might
need splitting into smaller patches. But for now here it is.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/cmd_ubifs.c b/common/cmd_ubifs.c
index 3cd2d8f..7752123 100644
--- a/common/cmd_ubifs.c
+++ b/common/cmd_ubifs.c
@@ -53,7 +53,7 @@
 	int ret;
 
 	if (argc != 2)
-		return cmd_usage(cmdtp);
+		return CMD_RET_USAGE;
 
 	vol_name = argv[1];
 	debug("Using volume %s\n", vol_name);
@@ -94,7 +94,7 @@
 int do_ubifs_umount(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
 	if (argc != 1)
-		return cmd_usage(cmdtp);
+		return CMD_RET_USAGE;
 
 	if (ubifs_initialized == 0) {
 		printf("No UBIFS volume mounted!\n");
@@ -141,18 +141,18 @@
 	}
 
 	if (argc < 3)
-		return cmd_usage(cmdtp);
+		return CMD_RET_USAGE;
 
 	addr = simple_strtoul(argv[1], &endp, 16);
 	if (endp == argv[1])
-		return cmd_usage(cmdtp);
+		return CMD_RET_USAGE;
 
 	filename = argv[2];
 
 	if (argc == 4) {
 		size = simple_strtoul(argv[3], &endp, 16);
 		if (endp == argv[3])
-			return cmd_usage(cmdtp);
+			return CMD_RET_USAGE;
 	}
 	debug("Loading file '%s' to address 0x%08x (size %d)\n", filename, addr, size);