[SLIP]: Remove redundant NULL pointer checks prior to kfree

Signed-off-by: NJesper Juhl <juhl-lkml@dif.dk>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/slip.c

@@ -185,14 +185,11 @@ sl_alloc_bufs(struct slip *sl, int mtu)
 	/* Cleanup */
 err_exit:
 #ifdef SL_INCLUDE_CSLIP
-	if (cbuff)
 	kfree(cbuff);
 	if (slcomp)
 		slhc_free(slcomp);
 #endif
-	if (xbuff)
 	kfree(xbuff);
-	if (rbuff)
 	kfree(rbuff);
 	return err;
 }
@@ -204,12 +201,12 @@ sl_free_bufs(struct slip *sl)
 	void * tmp;
 
 	/* Free all SLIP frame buffers. */
-	if ((tmp = xchg(&sl->rbuff, NULL)) != NULL)
+	tmp = xchg(&sl->rbuff, NULL);
 	kfree(tmp);
-	if ((tmp = xchg(&sl->xbuff, NULL)) != NULL)
+	tmp = xchg(&sl->xbuff, NULL);
 	kfree(tmp);
 #ifdef SL_INCLUDE_CSLIP
-	if ((tmp = xchg(&sl->cbuff, NULL)) != NULL)
+	tmp = xchg(&sl->cbuff, NULL);
 	kfree(tmp);
 	if ((tmp = xchg(&sl->slcomp, NULL)) != NULL)
 		slhc_free(tmp);
@@ -297,12 +294,9 @@ static int sl_realloc_bufs(struct slip *sl, int mtu)
 	spin_unlock_bh(&sl->lock);
 
 done:
-	if (xbuff)
 	kfree(xbuff);
-	if (rbuff)
 	kfree(rbuff);
 #ifdef SL_INCLUDE_CSLIP
-	if (cbuff)
 	kfree(cbuff);
 #endif
 	return err;