lpc_intrin_sse2.c : Add RESIDUAL16_RESULT macro.
lpc_intrin_sse2.c : Add RESIDUAL16_RESULT macro.

RESIDUAL16_RESULT is analogous to the existing RESIDUAL_RESULT macro
and simplifies the code a little.

Patch-from: lvqcl <eea571d36fd4ab6d1b7846011ee3606fc46f6b58@gmail.com>

fredericgermain/flac,waitman/flac,waitman/flac,fredericgermain/flac,waitman/flac,waitman/flac,fredericgermain/flac,fredericgermain/flac,waitman/flac