Refactor: libcrmcommon: Rearrange internal_ipc_get_reply.

This is intended to make the code a little easier to follow so I can
make further modifications to it. Changes:

• Rewrite conditionals and move them higher up in the function to allow unindenting things.

• Rename "bad" to "reply".

• Define variables at the top of the function. Note that a later patch will add a use of hdr at the bottom of the function, while reply will be turned into a parameter.

• Add a separate variable for the timeout we're passing to qb_ipcc_recv.