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kernel: try freebroken() *before* killbig() (thanks aiju)

--- a/sys/src/9/port/swap.c

+++ b/sys/src/9/port/swap.c

@@ -164,8 +164,8 @@

 		if(swapimage.c == nil || swapalloc.free == 0){

 		Killbig:

-			killbig("out of memory");

-			freebroken();		/* can use the memory */

+			if(!freebroken())

+				killbig("out of memory");

 			sched();

 			continue;

 		}