subsys: gdb_server: Fix type mismatch

This was flagged by ISSM icx compiler.

JIRA: ZEP-1806

Change-Id: Iebd04febbdce9b92a4d0cae986ca7f84f4da58a0
Signed-off-by: Jithu Joseph <jithu.joseph@intel.com>
1 file changed