UBIFS: check data CRC when in error state

When UBIFS switches to R/O mode because of an error,
it is reasonable to enable data CRC checking.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
diff --git a/fs/ubifs/io.c b/fs/ubifs/io.c
index 40e2790..0168271 100644
--- a/fs/ubifs/io.c
+++ b/fs/ubifs/io.c
@@ -62,6 +62,7 @@
 {
 	if (!c->ro_media) {
 		c->ro_media = 1;
+		c->no_chk_data_crc = 0;
 		ubifs_warn("switched to read-only mode, error %d", err);
 		dbg_dump_stack();
 	}