nfs: trivial: remove unused nfs_wait_event macro

Nothing uses this macro anymore.

Signed-off-by: Jeff Layton <[e-mail]>
Signed-off-by: Trond Myklebust <[e-mail]>

include/linux/nfs_fs.h

···
 	return ino;
 }
 
-#define nfs_wait_event(clnt, wq, condition)				\
-({									\
-	int __retval = wait_event_killable(wq, condition);		\
-	__retval;							\
-})
-
 #define NFS_JUKEBOX_RETRY_TIME (5 * HZ)
 
 #endif /* __KERNEL__ */