cmd_fuse: return CMD_RET_FAILURE on error

Fuse drivers, like the mxs_ocotp.c, may return negative error codes but
the commands are only allowed to return CMD_RET_* enum values to the
shell, otherwise the following error appears:

	"exit not allowed from main input shell."

Signed-off-by: Hector Palacios <[email protected]>
Reviewed-by: Benoît Thébaudeau <[email protected]>

common/cmd_fuse.c

@@ -128,7 +128,7 @@ static int do_fuse(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 
 err:
 	puts("ERROR\n");
-	return ret;
+	return CMD_RET_FAILURE;
 }
 
 U_BOOT_CMD(