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aux/vga: scale only if mode was set successfully

--- a/sys/src/cmd/aux/vga/vesa.c

+++ b/sys/src/cmd/aux/vga/vesa.c

@@ -280,8 +280,7 @@

 	if(vbesetmode(vbe, atoi(dbattr(vga->mode->attr, "id"))) < 0){

 		ctlr->flag |= Ferror;

 		fprint(2, "vbesetmode: %r\n");

-	}

-	if(vbe->scale != nil)

+	}else if(vbe->scale != nil)

 		vbe->scale(vga, ctlr);

 }