Validation of Number of Channels on WAV files

Corrects the validation of the number of channels that was causing a floating
point exception when this number is zero.
It also corrects the range of admitted channels on WAV files.

Change-Id: I35051ab1ee84e5b51e9c719781387e96b28ab656
Signed-off-by: Niel Alejandro Paz <niel.paz.hernandez@intel.com>
Signed-off-by: Dan Liang <dan.liang@intel.com>