[MTD] cmdlinepart: Missing partition info is not an error

Return 0 partitions instead of -EINVAL on no mtdpart= argument in kernel
cmdline or missing partition info for device.
Signed-off-by: NPeter Korsgaard <jacmet@sunsite.dk>
Acked-by: NStefan Roese <sr@denx.de>
Signed-off-by: NDavid Woodhouse <dwmw2@infradead.org>

drivers/mtd/cmdlinepart.c

@@ -310,9 +310,6 @@ static int parse_cmdline_partitions(struct mtd_info *master,
 	struct cmdline_mtd_partition *part;
 	char *mtd_id = master->name;
 
-	if(!cmdline)
-		return -EINVAL;
-
 	/* parse command line */
 	if (!cmdline_parsed)
 		mtdpart_setup_real(cmdline);
@@ -343,7 +340,7 @@ static int parse_cmdline_partitions(struct mtd_info *master,
 			return part->num_parts;
 		}
 	}
-	return -EINVAL;
+	return 0;
 }