libswscale/yuv2rgb.c:293: error: Uninitialized Value
  The value read from pa_1 was never initialized.

libswscale/yuv2rgb.c:293:5: 
291.     PUTRGBA(dst_2, py_2, pa_2, 3, 0);
292.     PUTRGBA(dst_1, py_1, pa_1, 3, 0);
293.     pa_1 += 8; \
         ^
294.     pa_2 += 8; \
295. ENDYUV2RGBLINE(8)
