mkvparser:Parse: s/FLT_MIN/-FLT_MAX/

FLT_MIN is the smallest finite value (numeric_limits::min()) -FLT_MAX is
the correct for the most negative (numeric_limits::lowest())

http://en.cppreference.com/w/cpp/types/numeric_limits

BUG=b/36255773
BUG=webm:1381

Change-Id: Iaaff611acffc3df28fef12af81ac5299791f0148
1 file changed