iwlegacy: mark poll bit as unlocked function

We do not take reg_lock during poll bit, so mark it such
using underscore.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
diff --git a/drivers/net/wireless/iwlegacy/iwl-3945.c b/drivers/net/wireless/iwlegacy/iwl-3945.c
index 6e2e71a..8c3ae39 100644
--- a/drivers/net/wireless/iwlegacy/iwl-3945.c
+++ b/drivers/net/wireless/iwlegacy/iwl-3945.c
@@ -757,7 +757,7 @@
 					APMG_PS_CTRL_VAL_PWR_SRC_VAUX,
 					~APMG_PS_CTRL_MSK_PWR_SRC);
 
-			il_poll_bit(il, CSR_GPIO_IN,
+			_il_poll_bit(il, CSR_GPIO_IN,
 				     CSR_GPIO_IN_VAL_VAUX_PWR_SRC,
 				     CSR_GPIO_IN_BIT_AUX_POWER, 5000);
 		}
@@ -767,7 +767,7 @@
 			APMG_PS_CTRL_VAL_PWR_SRC_VMAIN,
 			~APMG_PS_CTRL_MSK_PWR_SRC);
 
-	il_poll_bit(il, CSR_GPIO_IN, CSR_GPIO_IN_VAL_VMAIN_PWR_SRC,
+	_il_poll_bit(il, CSR_GPIO_IN, CSR_GPIO_IN_VAL_VMAIN_PWR_SRC,
 		     CSR_GPIO_IN_BIT_AUX_POWER, 5000);	/* uS */
 }