madwifi patch cleanup and stability fixes

- fix a semi-random heisenbug by replacing the previous noderef fix with a simple hack that is not 100% correct, but safe.
- add ad-hoc atim fixes by bruno
- add napi polling fixes by sven-ola
- fix compile breakage with debug enabled

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@12838 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/madwifi/patches/331-memory_alloc.patch

@@ -1,6 +1,6 @@
 --- a/ath/if_ath.c
 +++ b/ath/if_ath.c
-@@ -3322,17 +3322,18 @@
+@@ -3320,17 +3320,18 @@
  	 * without affecting any other bridge ports. */
  	if (skb_cloned(skb)) {
  		/* Remember the original SKB so we can free up our references */
@@ -25,7 +25,7 @@
  	eh = (struct ether_header *)skb->data;
  
  #ifdef ATH_SUPERG_FF
-@@ -3603,6 +3604,8 @@
+@@ -3601,6 +3602,8 @@
  	sc->sc_stats.ast_tx_mgmt++;
  	return 0;
  bad: