diag: Fix for possible dci error notification

This patch provides the protection on dci session by
checking for the session pid and task pid being same.

CRs-Fixed: 1008138
Change-Id: I7d78a13032365a42097ad71cfd0abab2792a1b98
Signed-off-by: Manoj Prabhu B <bmanoj@codeaurora.org>