leases: remove unneeded variable from fcntl_setlease().

fcntl_setlease() has a struct dentry* that is used only once; this patch
removes it.

Signed-off-by: David M. Richter <richterd@citi.umich.edu>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
diff --git a/fs/locks.c b/fs/locks.c
index 6a132cd..2e0fa66 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1493,8 +1493,7 @@
 int fcntl_setlease(unsigned int fd, struct file *filp, long arg)
 {
 	struct file_lock fl, *flp = &fl;
-	struct dentry *dentry = filp->f_path.dentry;
-	struct inode *inode = dentry->d_inode;
+	struct inode *inode = filp->f_path.dentry->d_inode;
 	int error;
 
 	locks_init_lock(&fl);