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Fix double-free fault when isaconfig returns nothing for "etherN". (from richard millers devether-doublefree patch)

--- a/sys/src/9/omap/devether.c

+++ b/sys/src/9/omap/devether.c

@@ -383,7 +383,7 @@

 			continue;

 		if(isaconfig("ether", ctlrno, ether) == 0){

-			free(ether);

+//			free(ether);

 //			return nil;

 			continue;

 		}

--- a/sys/src/9/teg2/devether.c

+++ b/sys/src/9/teg2/devether.c

@@ -381,7 +381,7 @@

 			continue;

 		if(isaconfig("ether", ctlrno, ether) == 0){

-			free(ether);

+//			free(ether);

 //			return nil;

 			continue;

 		}

-- 

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