iwlagn: mod param cleanup

All agn devices use the same module parameter structure.  Delete the
indirection and access the structure diretly.

Signed-off-by: Don Fry <donald.h.fry@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-lib.c b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
index 7fe9e0f..8e79653 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-lib.c
@@ -665,7 +665,7 @@
 
 	rb_timeout = RX_RB_TIMEOUT;
 
-	if (priv->cfg->mod_params->amsdu_size_8K)
+	if (iwlagn_mod_params.amsdu_size_8K)
 		rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_8K;
 	else
 		rb_size = FH_RCSR_RX_CONFIG_REG_VAL_RB_SIZE_4K;