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tga: fix flip/reflect

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

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

@@ -473,9 +473,9 @@

 		werrstr("ReadTGA: decode fail (%d!=%d) - %r\n", n, num);

 		goto Error;

 	}

-	if(h->xorigin != 0)

+	if((h->descriptor&(1<<4)) != 0)

 		reflect(ar);

-	if(h->yorigin == 0)

+	if((h->descriptor&(1<<5)) == 0)

 		flip(ar);

 	free(h);

-- 

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