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jpg: check read count when reading png magic (harmless)

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

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

@@ -388,8 +388,8 @@

 	ZlibW zw;

 	buf = pngmalloc(IDATSIZE, 0);

-	Bread(b, buf, sizeof PNGmagic);

-	if(memcmp(PNGmagic, buf, sizeof PNGmagic) != 0)

+	if(Bread(b, buf, sizeof PNGmagic) != sizeof PNGmagic

+	|| memcmp(PNGmagic, buf, sizeof PNGmagic) != 0)

 		sysfatal("bad PNGmagic");

 	n = getchunk(b, type, buf, IDATSIZE);

-- 

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