libswscale/swscale.c:1181: error: Uninitialized Value
  The value read from A1 was never initialized.

libswscale/swscale.c:1181:9: 
1179. 
1180.     if (uvalpha < 2048) {
1181.         YSCALE_YUV_2_ANYRGB_C(YSCALE_YUV_2_RGB1_C)
              ^
1182.     } else {
1183.         YSCALE_YUV_2_ANYRGB_C(YSCALE_YUV_2_RGB1B_C)
