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hjfs: fix erealloc(..., 0) crash when removing member from group array makes it empty (thanks 9dan)

--- a/sys/src/cmd/hjfs/main.c

+++ b/sys/src/cmd/hjfs/main.c

@@ -31,7 +31,7 @@

 erealloc(void *v, int c)

 {

 	v = realloc(v, c);

-	if(v == 0)

+	if(v == 0 && c != 0)

 		sysfatal("realloc: %r");

 	setrealloctag(v, getcallerpc(&c));

 	return v;