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devip: dont shoot the messenger (dont unbind the interface when ipipu4/ipiput6 errors)

The medium should only self-unbind when we get a read error
from the device, not when ipiput4/8() throw an error,
which can happen for the nullmedium.

--- a/sys/src/9/ip/ethermedium.c

+++ b/sys/src/9/ip/ethermedium.c

@@ -338,7 +338,7 @@

 		rlock(ifc);

 		if(waserror()){

 			runlock(ifc);

-			nexterror();

+			continue;

 		}

 		ifc->in++;

 		if(ifc->lifc == nil || BLEN(bp) <= ETHERHDRSIZE)

@@ -379,7 +379,7 @@

 		rlock(ifc);

 		if(waserror()){

 			runlock(ifc);

-			nexterror();

+			continue;

 		}

 		ifc->in++;

 		if(ifc->lifc == nil || BLEN(bp) <= ETHERHDRSIZE)

--- a/sys/src/9/ip/netdevmedium.c

+++ b/sys/src/9/ip/netdevmedium.c

@@ -120,7 +120,7 @@

 		rlock(ifc);

 		if(waserror()){

 			runlock(ifc);

-			nexterror();

+			continue;

 		}

 		ifc->in++;

 		if(ifc->lifc == nil)

-- 

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