cifs: update internal version number

To 2.51
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/smb/client/cifsfs.h

@@ -146,6 +146,6 @@ extern const struct export_operations cifs_export_ops;
 #endif /* CONFIG_CIFS_NFSD_EXPORT */
 
 /* when changing internal version - update following two lines at same time */
-#define SMB3_PRODUCT_BUILD 50
-#define CIFS_VERSION   "2.50"
+#define SMB3_PRODUCT_BUILD 51
+#define CIFS_VERSION   "2.51"
 #endif				/* _CIFSFS_H */