zisofs use mutex instead of semaphore

Use mutex instead of semaphore in fs/isofs/compress.c, and remove an
unnecessary variable.

Signed-off-by: Dave Young <[email protected]>
Acked-by: H. Peter Anvin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
1 file changed