[CIFS] remove sparse warning

Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index babd27a..b1e1fc6 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -708,7 +708,7 @@
 
 	if ((tcon->ses->capabilities & CAP_UNIX) &&
 	    (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) &&
-	    (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL == 0))
+	    ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
 		posix_locking = 1;
 	/* BB add code here to normalize offset and length to
 	account for negative length which we can not accept over the