Comment 3 for bug 1554072

A compilation issue... scratch_buffer.ipq is not a pointer:

  CC hipfw/rewrite.o
hipfw/rewrite.c: In function ‘hip_fw_context_enable_write’:
hipfw/rewrite.c:150:28: error: incompatible types when assigning to type ‘hip_ipq_packet_msg’ from type ‘struct hip_ipq_packet_msg **’
         scratch_buffer.ipq = &ctx->ipq_packet;