[x265] bugfix: segfault during user SEI copy

[Steven Toth]

When multiple x265_picture_t pics are passed to the encoder, if the second
pic has a longer user SEI message than the first, make sure we reallocate
the existing frame allocation in order to fit the longer messages, else a
segfault occurs when the allocate is overrun.

Signed-of-By: <steven.toth at ltnglobal.com>

- Steven Toth
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