Update lpc_intrin_sse.c

[Shark64]

Minor change, remove redundant assignment before broadcasting into xmm registers

[erikd]

@lvqcl What do you think? The Travis failure was a timeout and hence should be ignored (but I have restarted it).

[lvqcl]

I tested MSVS 2105 and GCC 7.1, and they generate exactly the same code before and after this change, so it should be OK.

[erikd]

Thanks @lvqcl for reviewing.

Thanks @Shark64 for the patch. I've manually merged it into the Xiph.org git tree which will be mirrored here in the next 24 or so hours.