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lib9p: handle erealloc9p(..., 0)

--- a/sys/src/lib9p/mem.c

+++ b/sys/src/lib9p/mem.c

@@ -24,7 +24,7 @@

 {

 	void *nv;

-	if((nv = realloc(v, sz)) == nil) {

+	if((nv = realloc(v, sz)) == nil && sz != 0) {

 		fprint(2, "out of memory allocating %lud\n", sz);

 		exits("mem");

 	}