staging: brcm80211: removed brcms_c_module_unregister() call in ampdu.c

The AMPDU module was never registered, so it does not have to be unregistered.
Reviewed-by: NPieter-Paul Giesberts <pieterpg@broadcom.com>
Signed-off-by: NArend van Spriel <arend@broadcom.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/brcm80211/brcmsmac/ampdu.c

@@ -243,7 +243,6 @@ void brcms_c_ampdu_detach(struct ampdu_info *ampdu)
 	for (i = 0; i < AMPDU_INI_FREE; i++)
 		kfree(ampdu->ini_free[i]);
 
-	brcms_c_module_unregister(ampdu->wlc->pub, "ampdu", ampdu);
 	kfree(ampdu);
 }