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ether82557: panic() if receive buffer allocation fails on init

--- a/sys/src/9/pc/ether82557.c

+++ b/sys/src/9/pc/ether82557.c

@@ -783,6 +783,8 @@

 	link = NullPointer;

 	for(i = 0; i < Nrfd; i++){

 		bp = rfdalloc(link);

+		if(bp == nil)

+			panic("i82557: can't allocate rfd buffer");

 		if(ctlr->rfdhead == nil)

 			ctlr->rfdtail = bp;

 		bp->next = ctlr->rfdhead;

-- 

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