cifs: map NT_STATUS_ERROR_WRITE_PROTECTED to -EROFS

Seems like a more sensible mapping than -EIO.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/netmisc.c b/fs/cifs/netmisc.c
index 3489468..c6721ee 100644
--- a/fs/cifs/netmisc.c
+++ b/fs/cifs/netmisc.c
@@ -61,6 +61,7 @@
 	{ERRremcd, -EACCES},
 	{ERRdiffdevice, -EXDEV},
 	{ERRnofiles, -ENOENT},
+	{ERRwriteprot, -EROFS},
 	{ERRbadshare, -ETXTBSY},
 	{ERRlock, -EACCES},
 	{ERRunsup, -EINVAL},