cmd: blkcache: simplify sub-command handling

Signed-off-by: Eric Nelson <eric@nelint.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
diff --git a/cmd/blkcache.c b/cmd/blkcache.c
index a3dd549..d7afe3e 100644
--- a/cmd/blkcache.c
+++ b/cmd/blkcache.c
@@ -73,12 +73,10 @@
 
 	c = find_cmd_tbl(argv[0], &cmd_blkc_sub[0], ARRAY_SIZE(cmd_blkc_sub));
 
-	if (c)
-		return c->cmd(cmdtp, flag, argc, argv);
-	else
+	if (!c)
 		return CMD_RET_USAGE;
 
-	return 0;
+	return c->cmd(cmdtp, flag, argc, argv);
 }
 
 U_BOOT_CMD(