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gs: fix font ownership

--- a/op.c

+++ b/op.c

@@ -80,6 +80,14 @@

 	p->nGS += 1;

 	p->GSactive = &p->GS[p->nGS - 1];

 	*(p->GSactive) = p->GS[p->nGS - 2];

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

+		p->GSactive->Font.widths = malloc(sizeof(int) * (p->GSactive->Font.last - p->GSactive->Font.first + 1));

+		if(p->GSactive->Font.widths == nil){

+			werrstr("gspush: out of memory allocating space for glyph widths");

+			return 0;

+		}

+		memcpy(p->GSactive->Font.widths, p->GS[p->nGS - 2].Font.widths, sizeof(int) * (p->GSactive->Font.last - p->GSactive->Font.first + 1));

+	}

 	return 1;

 }

@@ -1247,10 +1255,6 @@

 gsfree(GS gs)

 {

 	free(gs.Font.widths);

-	pdfobjfree(gs.Font.font);

-	gs.Font.font = nil;

-	gs.Font.enc = nil;

-	gs.Font.widths = nil;

 }

 void