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bzfs: handle erealloc(..., 0)

--- a/sys/src/cmd/bzfs/oramfs.c

+++ b/sys/src/cmd/bzfs/oramfs.c

@@ -813,7 +813,7 @@

 erealloc(void *p, ulong n)

 {

 	p = realloc(p, n);

-	if(!p)

+	if(!p && n)

 		error("out of memory");

 	return p;

 }