[CIFS] Byte range unlock request to non-Unix server can unlock too much

On a mount without posix extensions enabled, when an unlock request is
made, the client can release more than is intended. To reproduce, on a
CIFS mount without posix extensions enabled:

1) open file
2) do fcntl lock: start=0 len=1
3) do fcntl lock: start=2 len=1
4) do fcntl unlock: start=0 len=1

...on the unlock call the client sends an unlock request to the server
for both locks. The problem is a bad test in cifs_lock.

Signed-off-by: Jeff Layton <[email protected]>
Signed-off-by: Steve French <[email protected]>

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