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libdraw: get rid of _drawdebug variable

--- a/sys/include/ape/draw.h

+++ b/sys/include/ape/draw.h

@@ -509,7 +509,6 @@

 extern	Image	*screen;

 extern	Screen	*_screen;

 extern	int	_cursorfd;

-extern	int	_drawdebug;	/* set to 1 to see errors from flushimage */

 extern	void	_setdrawop(Display*, Drawop);

 #define	BGSHORT(p)	((p)[0]|((p)[1]<<8))

--- a/sys/include/draw.h

+++ b/sys/include/draw.h

@@ -502,7 +502,6 @@

 extern	Image	*screen;

 extern	Screen	*_screen;

 extern	int	_cursorfd;

-extern	int	_drawdebug;	/* set to 1 to see errors from flushimage */

 extern	void	_setdrawop(Display*, Drawop);

 #define	BGSHORT(p)	((p)[0]|((p)[1]<<8))

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

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

@@ -5,7 +5,6 @@

 Display	*display;

 Font	*font;

 Image	*screen;

-int	_drawdebug = 0;

 static char deffontname[] = "*default*";

 Screen	*_screen;

@@ -411,15 +410,13 @@

 int

 doflush(Display *d)

 {

-	int n, nn;

+	int n;

 	n = d->bufp-d->buf;

 	if(n <= 0)

 		return 1;

-	if((nn=write(d->fd, d->buf, n)) != n){

-		if(_drawdebug)

-			fprint(2, "flushimage fail: d=%p: n=%d nn=%d %r\n", d, n, nn); /**/

+	if(write(d->fd, d->buf, n) != n){

 		d->bufp = d->buf;	/* might as well; chance of continuing */

 		return -1;

 	}