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libdraw: don't deference nil display in freefont

--- a/sys/src/libdraw/buildfont.c

+++ b/sys/src/libdraw/buildfont.c

@@ -129,8 +129,9 @@

 	}

 	for(i=0; i<f->nsubf; i++){

 		s = f->subf[i].f;

-		if(s && s!=display->defaultsubfont)

-			freesubfont(s);

+		if(s)

+			if(display == nil || s!=display->defaultsubfont)

+				freesubfont(s);

 	}

 	freeimage(f->cacheimage);

 	free(f->name);