lguest_user.c: fix memory leak

This patch fixes a memory leak spotted by the Coverity checker.
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/lguest/lguest_user.c

@@ -184,7 +184,7 @@ static int initialize(struct file *file, const unsigned long __user *input)
 free_regs:
 	free_page(lg->regs_page);
 release_guest:
-	memset(lg, 0, sizeof(*lg));
+	kfree(lg);
 unlock:
 	mutex_unlock(&lguest_lock);
 	return err;