Fixed bad memory allocation, which was causing corruption

Fixed bad memory allocation, which was causing corruption

Previously the stack was allocating based on a variable that was
never actually set, and despite that was likely allocating based on
the incorrect data.  This patch ensures that the allocation is
based on the actual size of the string.

Change-Id: Ie2feafe665b870919e17222dade5548794b6ce67
Signed-off-by: Erich Keane <erich.keane@intel.com>