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ether83815: dont raise error() from etherreset

can't raise error() without process context. use panic() instead.

--- a/sys/src/9/pc/ether83815.c

+++ b/sys/src/9/pc/ether83815.c

@@ -644,7 +644,7 @@

 	for(des = ctlr->rdr; des < &ctlr->rdr[ctlr->nrdr]; des++){

 		des->bp = iallocb(Rbsz);

 		if(des->bp == nil)

-			error(Enomem);

+			panic("ether83815: can't allocate receive buffer");

 		des->cmdsts = Rbsz;

 		des->addr = PADDR(des->bp->rp);

 		if(last != nil)

-- 

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