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Change the y4m buffer allocation size

This attempts to fix issue #847

Change-Id: Ifa2f96b6b33624004272d83363e089b5b4dc5626

--- a/y4minput.c

+++ b/y4minput.c

@@ -975,9 +975,9 @@

                      + 2 * ((_y4m->pic_w + _y4m->dst_c_dec_h - 1) / _y4m->dst_c_dec_h) *

                      ((_y4m->pic_h + _y4m->dst_c_dec_v - 1) / _y4m->dst_c_dec_v);

   if (_y4m->bit_depth == 8)

-    _y4m->dst_buf = (unsigned char *)malloc(_y4m->dst_buf_sz);

+    _y4m->dst_buf = (unsigned char *)malloc(_y4m->dst_buf_read_sz);

   else

-    _y4m->dst_buf = (unsigned char *)malloc(2 * _y4m->dst_buf_sz);

+    _y4m->dst_buf = (unsigned char *)malloc(2 * _y4m->dst_buf_read_sz);

   if (_y4m->aux_buf_sz > 0)

     _y4m->aux_buf = (unsigned char *)malloc(_y4m->aux_buf_sz);