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jpg: output partial image data when available (truncated files)

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

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

@@ -226,9 +226,9 @@

 	va_start(arg, fmt);

 	vseprint(h->err, h->err+sizeof h->err, fmt, arg);

 	va_end(arg);

-

+	if(h->image != nil)

+		fprint(2, "jpg: partial image: %s\n", h->err);

 	werrstr("%s", h->err);

-	jpgfreeall(h, 1);

 	longjmp(h->errlab, 1);

 }

@@ -258,7 +258,7 @@

 	h->fd = b;

 	errstr(buf, sizeof buf);	/* throw it away */

 	if(setjmp(h->errlab))

-		r = nil;

+		r = h->image;

 	else

 		r = readslave(h, colorspace);

 	jpgfreeall(h, 0);