cmd: load, emit error message for invalid block device

The load command should not silently return to the console prompt if an
invalid block device is specified and no file is loaded.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/fs/fs.c b/fs/fs.c
index 68a1555..0c8f577 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -710,8 +710,10 @@
 	if (argc > 7)
 		return CMD_RET_USAGE;
 
-	if (fs_set_blk_dev(argv[1], (argc >= 3) ? argv[2] : NULL, fstype))
+	if (fs_set_blk_dev(argv[1], (argc >= 3) ? argv[2] : NULL, fstype)) {
+		log_err("Can't set block device\n");
 		return 1;
+	}
 
 	if (argc >= 4) {
 		addr = simple_strtoul(argv[3], &ep, 16);