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isdn: isdnloop: fix pointer dereference bug

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clang has spotted an ancient code bug and warns about it with:

drivers/isdn/isdnloop/isdnloop.c:573:12: error: address of array 'card->rcard' will always evaluate to 'true' [-Werror,-Wpointer-bool-conversion]

This is an array of pointers, so we should check if a specific
pointer exists in the array before using it, not whether the
array itself exists.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnd Bergmann 2019-03-07 10:32:07 +01:00 committed by David S. Miller
parent f096ca63ca
commit 8a72b81e6d
1 changed files with 1 additions and 1 deletions
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drivers/isdn/isdnloop/isdnloop.c
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@ -570,7 +570,7 @@ isdnloop_atimeout(isdnloop_card *card, int ch)
char buf[60];
spin_lock_irqsave(&card->isdnloop_lock, flags);
if (card->rcard) {
if (card->rcard[ch]) {
isdnloop_fake(card->rcard[ch], "DDIS_I", card->rch[ch] + 1);
card->rcard[ch]->rcard[card->rch[ch]] = NULL;
card->rcard[ch] = NULL;