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png: remove bogus chanlen warning

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

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

@@ -132,7 +132,6 @@

 	Rawimage **array, *r, *c;

 	Image *i, *i2;

 	int j, ch, outchan;

-	long len;

 	Biobuf b;

 	char buf[32];

 	static int inited;

@@ -207,24 +206,6 @@

 	}

 	if(nineflag){

 		chantostr(buf, outchan);

-		len = (c->r.max.x - c->r.min.x) * (c->r.max.y - c->r.min.y);

-		switch(c->chandesc){

-		case CY:

-			// len *= 1;

-			break;

-		case CYA16:

-			len *= 2;

-			break;

-		case CRGB24:

-			len *= 3;

-			break;

-		case CRGBA32:

-			len *= 4;

-			break;

-		}

-		if(c->chanlen != len)

-			fprint(2, "%s: writing %d bytes for len %ld chan %s\n",

-				argv0, c->chanlen, len, buf);

 		print("%11s %11d %11d %11d %11d ", buf,

 			c->r.min.x, c->r.min.y, c->r.max.x, c->r.max.y);

 		if(write(1, c->chans[0], c->chanlen) != c->chanlen){