drivers: net: Remove remaining alloc/OOM messages

alloc failures already get standardized OOM
messages and a dump_stack.

For the affected mallocs around these OOM messages:

Converted kmallocs with multiplies to kmalloc_array.
Converted a kmalloc/memcpy to kmemdup.
Removed now unused stack variables.
Removed unnecessary parentheses.
Neatened alignment.

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Arend van Spriel <arend@broadcom.com>
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Acked-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 42cf3c7..2a2ae40 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -2981,13 +2981,8 @@
 	struct ath_gen_timer *timer;
 
 	timer = kzalloc(sizeof(struct ath_gen_timer), GFP_KERNEL);
-
-	if (timer == NULL) {
-		ath_err(ath9k_hw_common(ah),
-			"Failed to allocate memory for hw timer[%d]\n",
-			timer_index);
+	if (timer == NULL)
 		return NULL;
-	}
 
 	/* allocate a hardware generic timer slot */
 	timer_table->timers[timer_index] = timer;