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png: sysfatal, debug print to stderr instead of potentialy messing up output stream

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

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

@@ -175,6 +175,8 @@

 	int i;

 	switch(alg){

+	default:

+		fprint(2, "unknown filtering scheme %d\n", alg);

 	case FilterNone:

 		break;

@@ -201,9 +203,6 @@

 		for(; i < len; ++i)

 			buf[i] += paeth(buf[i-bypp], up[i], up[i-bypp]);

 		break;

-

-	default:

-		sysfatal("unknown filtering scheme %d\n", alg);

 	}

 }

@@ -312,7 +311,7 @@

 	else

 		n = (dx+adx-1)/adx;

 	if(n != 1 + (z->dx - (adam7[z->pass].x+1)) / adam7[z->pass].dx){

-		print("%d/%d != 1+(%d-1)/%d = %d\n",

+		fprint(2, "%d/%d != 1+(%d-1)/%d = %d\n",

 			z->dx - adam7[z->pass].x - 1 + adx, adx,

 			z->dx - (adam7[z->pass].x+1), adam7[z->pass].dx,

 			1 + (z->dx - (adam7[z->pass].x+1)) / adam7[z->pass].dx);

-- 

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