diag: dci: Correct out of bounds check in processing dci pkt rsp

Correct the out of bounds check and prevent moving the temp pointer
further than out of bounds check which is not necessary while
processing dci pkt rsp.

Change-Id: I01f8cd7454aff81b24c986eade35c79724976151
Signed-off-by: Manoj Prabhu B <bmanoj@codeaurora.org>