ath9k_htc: drv_init: match wait_for_completion_timeout return type

Return type of wait_for_completion_timeout is unsigned long not int.
As time_left is exclusively used for wait_for_completion_timeout here its
type is simply changed to unsigned long.

API conformance testing for completions with coccinelle spatches are being
used to locate API usage inconsistencies:
./drivers/net/wireless/ath/ath9k/htc_drv_init.c:81
	int return assigned to unsigned long

Patch was compile tested with x86_64_defconfig + CONFIG_ATH_CARDS=m,
CONFIG_ATH9K_HTC=m

Patch is against 4.1-rc3 (localversion-next is -next-20150514)
Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ath/ath9k/htc_drv_init.c

@@ -74,7 +74,7 @@ static struct ath_ps_ops ath9k_htc_ps_ops = {
 
 static int ath9k_htc_wait_for_target(struct ath9k_htc_priv *priv)
 {
-	int time_left;
+	unsigned long time_left;
 
 	if (atomic_read(&priv->htc->tgt_ready) > 0) {
 		atomic_dec(&priv->htc->tgt_ready);