[PATCH 4/5] ISDN-CAPI: Adjust checks for null pointers in four functions

[SF Markus Elfring <elfring@users.sourceforge.net>]

From: Markus Elfring <elfring@users.sourceforge.net>
Date: Sun, 25 Sep 2016 12:26:38 +0200
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The script "checkpatch.pl" can point information out like the following.

Comparison to NULL could be written !…

Thus fix the affected source code places.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 drivers/isdn/capi/capidrv.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/isdn/capi/capidrv.c b/drivers/isdn/capi/capidrv.c
index bd614e3..83f756d 100644
--- a/drivers/isdn/capi/capidrv.c
+++ b/drivers/isdn/capi/capidrv.c
@@ -334,8 +334,7 @@ static capidrv_plci *new_plci(capidrv_contr *card, int chan)
 	capidrv_plci *plcip;
 
 	plcip = kzalloc(sizeof(capidrv_plci), GFP_ATOMIC);
-
-	if (plcip == NULL)
+	if (!plcip)
 		return NULL;
 
 	plcip->state = ST_PLCI_NONE;
@@ -403,8 +402,7 @@ static inline capidrv_ncci *new_ncci(capidrv_contr *card,
 	capidrv_ncci *nccip;
 
 	nccip = kzalloc(sizeof(capidrv_ncci), GFP_ATOMIC);
-
-	if (nccip == NULL)
+	if (!nccip)
 		return NULL;
 
 	nccip->ncci = ncci;
@@ -757,7 +755,7 @@ static inline int new_bchan(capidrv_contr *card)
 {
 	int i;
 	for (i = 0; i < card->nbchan; i++) {
-		if (card->bchans[i].plcip == NULL) {
+		if (!card->bchans[i].plcip) {
 			card->bchans[i].disconnecting = 0;
 			return i;
 		}
@@ -2192,7 +2190,7 @@ static void enable_dchannel_trace(capidrv_contr *card)
 		       card->name, errcode);
 		return;
 	}
-	if (strstr(manufacturer, "AVM") == NULL) {
+	if (!strstr(manufacturer, "AVM")) {
 		printk(KERN_ERR "%s: not from AVM, no d-channel trace possible (%s)\n",
 		       card->name, manufacturer);
 		return;
-- 
2.10.0