futex2: Fix compilation warnings

/home/krisman/linux-tmp/kernel/futex2.c: In function
‘futex_get_shared_key’: /home/krisman/linux-tmp/kernel/futex2.c:156:6: warning: unused variable ‘ret’ [-Wunused-variable]
int ret, err;
    ^~~
/home/krisman/linux-tmp/kernel/futex2.c: In function
‘__do_sys_futex_wait’: /home/krisman/linux-tmp/kernel/futex2.c:561:16:
warning: assignment to ‘uintptr_t’ {aka ‘long unsigned int’} from
‘void *’ makes integer from pointer without a cast [-Wint-conversion]
waiter->uaddr = uaddr;
		^
/home/krisman/linux-tmp/kernel/futex2.c: In function
‘futex_parse_waitv’: /home/krisman/linux-tmp/kernel/futex2.c:620:28:
warning: assignment to ‘uintptr_t’ {aka ‘long unsigned int’} from ‘void *’ makes integer from pointer without a cast [-Wint-conversion]
futexv->objects[i].uaddr = waitv.uaddr;

Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>

kernel/futex2.c

@@ -153,7 +153,7 @@ static u64 get_inode_sequence_number(struct inode *inode)
 static int futex_get_shared_key(uintptr_t address, struct mm_struct *mm,
 				struct futex_key *key)
 {
-	int ret, err;
+	int err;
 	struct page *page, *tail;
 	struct address_space *mapping;
 
@@ -558,7 +558,7 @@ SYSCALL_DEFINE4(futex_wait, void __user *, uaddr, unsigned int, val,
 	waiter = &wait_single.waiter;
 	waiter->index = 0;
 	waiter->val = val;
-	waiter->uaddr = uaddr;
+	waiter->uaddr = (uintptr_t) uaddr;
 
 	INIT_LIST_HEAD(&waiter->list);
 
@@ -617,7 +617,7 @@ static int futex_parse_waitv(struct futexv *futexv,
 		futexv->objects[i].flags = waitv.flags;
 		futexv->objects[i].index = i;
 		INIT_LIST_HEAD(&futexv->objects[i].list);
-		futexv->objects[i].uaddr = waitv.uaddr;
+		futexv->objects[i].uaddr = (uintptr_t) waitv.uaddr;
 	}
 
 	return 0;