cifs: connect: style: Simplify bool comparison

Fix the following coccicheck warning:
./fs/cifs/connect.c:3740:6-21: WARNING: Comparison of 0/1 to bool
variable

Signed-off-by: YANG LI <abaci-bugfix@linux.alibaba.com>
Reported-by: Abaci Robot<abaci@linux.alibaba.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

Author: YANG LI

fs/cifs/connect.c

@@ -3740,7 +3740,7 @@ cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
 
 	if (!ses->binding) {
 		ses->capabilities = server->capabilities;
-		if (linuxExtEnabled == 0)
+		if (!linuxExtEnabled)
 			ses->capabilities &= (~server->vals->cap_unix);
 
 		if (ses->auth_key.response) {