[MTD] Fix const assignment in the MTD command line partitioning driver

Fix const to non-const pointer assignment in the MTD command line partitioning
driver.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/mtd/cmdlinepart.c b/drivers/mtd/cmdlinepart.c
index 68782ab..71bc07f 100644
--- a/drivers/mtd/cmdlinepart.c
+++ b/drivers/mtd/cmdlinepart.c
@@ -306,7 +306,7 @@
 	unsigned long offset;
 	int i;
 	struct cmdline_mtd_partition *part;
-	char *mtd_id = master->name;
+	const char *mtd_id = master->name;
 
 	/* parse command line */
 	if (!cmdline_parsed)