platform: msm_shared: Fixed the memory leak of str_target

The str_align_right be called twice, but it only be freed once.
So free the str_target after current call finished, so that it
could not impact next call

CRs-Fixed: 996655
Change-Id: I6e4b8e777e15932e89b6931efbcdceeb5e715405
1 file changed