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resample: fix aspect-preserving scaling

--- a/resample.c

+++ b/resample.c

@@ -124,10 +124,10 @@

 		ih = h;

 	}

-	if(ow < 1)

+	if(ow == 0 && oh == 0){

 		ow = iw;

-	if(oh < 1)

 		oh = ih;

+	}

 	if(wp)

 		ow = iw*ow/100.0;

 	if(hp)