webpmux: fix exit status on numeric value parse error

in most cases 'ok' is set via a goto macro

Change-Id: I17c832446bf3e716d3bcd323dbcc72bec544029c
webpmux: fix indent

+ remove unnecessary cast

Change-Id: I2070fbe6aeda49f5790c69390e5b539a2c1a5616
webpmux: simplify InitializeConfig()

put WebPMuxConfig on the stack in main() rather than allocating it in
InitializeConfig(); removes a level of indirection there.

Change-Id: I81d386f7472ebbd322dd3fdbfda9d78dbeb62a66
Merge "webpmux: simplify InitializeConfig()"
Optimize lossless decoding for trivial(ARB) codes.

Optimize the decoding for region that have trivial literal codes.
The trivial literal is defined as huffman image with Red, Blue and Alpha
huffman trees with only single code values.
This speeds up lossless decoding by 3%

Change-Id: I0204949917836f74c0eb4ba5a7f4052a4797833b