Fix temp image dimensions in transform (#5594)

The temporary image should be the same size as the transformed image,
not the original image.

rtengine/iptransform.cc

@@ -695,7 +695,7 @@ void ImProcFunctions::transform (Imagefloat* original, Imagefloat* transformed,
             // steps, using an intermediate temporary image. There's room for
             // optimization of course...
             if (pLCPMap && params->lensProf.useCA && pLCPMap->isCACorrectionAvailable()) {
-                tmpimg.reset(new Imagefloat(original->getWidth(), original->getHeight()));
+                tmpimg.reset(new Imagefloat(transformed->getWidth(), transformed->getHeight()));
                 dest = tmpimg.get();
             }
         }