powerpc: cmd_ecctest: Use return value of cmd_usage

Use the return value of cmd_usage instead of ignoring this
and returning a 1.

Signed-off-by: Thomas Weber <weber@corscience.de>
Acked-by: Mike Frysinger <vapier@gentoo.org>

arch/powerpc/cpu/ppc4xx/cmd_ecctest.c

@@ -190,15 +190,13 @@ static int do_ecctest(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	int error;
 
 	if (argc < 3) {
-		cmd_usage(cmdtp);
-		return 1;
+		return cmd_usage(cmdtp);
 	}
 
 	ptr = (u32 *)simple_strtoul(argv[1], NULL, 16);
 	error = simple_strtoul(argv[2], NULL, 16);
 	if ((error < 1) || (error > 2)) {
-		cmd_usage(cmdtp);
-		return 1;
+		return cmd_usage(cmdtp);
 	}
 
 	printf("Using address %p for %d bit ECC error injection\n",