cmd_usage(): simplify return code handling

Lots of code use this construct:

	cmd_usage(cmdtp);
	return 1;

Change cmd_usage() let it return 1 - then we can replace all these
ocurrances by

	return cmd_usage(cmdtp);

This fixes a few places with incorrect return code handling, too.

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/common/cmd_bedbug.c b/common/cmd_bedbug.c
index d01ee19..2bd62e2 100644
--- a/common/cmd_bedbug.c
+++ b/common/cmd_bedbug.c
@@ -84,10 +84,8 @@
 	addr = dis_last_addr;
 	len = dis_last_len;
 
-	if (argc < 2) {
-		cmd_usage(cmdtp);
-		return 1;
-	}
+	if (argc < 2)
+		return cmd_usage(cmdtp);
 
 	if ((flag & CMD_FLAG_REPEAT) == 0) {
 		/* New command */
@@ -125,10 +123,8 @@
 	/* -------------------------------------------------- */
 	int rcode = 0;
 
-	if (argc < 2) {
-		cmd_usage(cmdtp);
-		return 1;
-	}
+	if (argc < 2)
+		return cmd_usage(cmdtp);
 
 	printf ("\nEnter '.' when done\n");
 	mem_addr = simple_strtoul (argv[1], NULL, 16);