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gs: prevent double-free

--- a/op.c

+++ b/op.c

@@ -1258,12 +1258,14 @@

 pagegsclean(Page *p)

 {

 	int i;

-	p->GSactive = nil;

-	for(i = 0; i < p->nGS; i += 1)

-		gsfree(p->GS[i]);

-	free(p->GS);

-	p->GS = nil;

-	p->nGS = 0;

+	if(p->GSactive != nil){

+		p->GSactive = nil;

+		for(i = 0; i < p->nGS; i += 1)

+			gsfree(p->GS[i]);

+		free(p->GS);

+		p->GS = nil;

+		p->nGS = 0;

+	}

 }

 static int