* Removed -Wno-unused from all KernelMergeObjects in kernel Jamfiles.

* Fixed most of the warnings resulting from that by removing actually not used
  variables or moving declaration into the #IF. Left unused functions there
  though, as I wouldn't know if they are supposed to be used again.
* Fixed two statements with no effect (clamping to MAX_ANCILLARY_DATA_LEN in
  socket.cpp and unsetting fCounterSem in MessagingService.cpp).
* Some style cleanups.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26253 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/kernel/fs/fd.cpp

@@ -856,8 +856,6 @@ _user_seek(int fd, off_t pos, int seekType)
 status_t
 _user_ioctl(int fd, ulong op, void *buffer, size_t length)
 {
-	struct file_descriptor *descriptor;
-
 	if (!IS_USER_ADDRESS(buffer))
 		return B_BAD_ADDRESS;