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ico: fix interpretation of 0 widths/heights

--- a/sys/src/cmd/jpg/ico.c

+++ b/sys/src/cmd/jpg/ico.c

@@ -13,8 +13,8 @@

 {

 	Icon	*next;

-	uchar	w;		/* icon width */

-	uchar	h;		/* icon height */

+	ushort	w;		/* icon width */

+	ushort	h;		/* icon height */

 	ushort	ncolor;		/* number of colors */

 	ushort	nplane;		/* number of bit planes */

 	ushort	bits;		/* bits per pixel */

@@ -268,6 +268,11 @@

 	icon->h = getl(buf+8)>>1;

 	icon->nplane = gets(buf+12);

 	icon->bits = gets(buf+14);

+

+	if(icon->w == 0)

+		icon->w = 256;

+	if(icon->h == 0)

+		icon->h = 256;

 	/* limit what we handle */

 	switch(icon->bits){