Fix mismatched delete/new couple

In RecordThread::readInputParameters(), mRsmpInBuffer is allocated
with new[] and should be freed with delete[] instead of delete.

This error has been found by valgrind.

Change-Id: I2f947abb658a21a7d1e61eebb99270cb37d2d147
Signed-off-by: Andrei V. FOMITCHEV <andreix.fomitchev@intel.com>
Signed-off-by: David Wagner <david.wagner@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>