fs/cifs: Simplify bool comparison.

Fix the follow warnings:

./fs/cifs/connect.c: WARNING: Comparison of 0/1 to bool variable

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