remote: Small cleanup in compare_section_command
The set_general_process call in compare_sections_command isn't
actually needed. remote_target::verify_memory and
remote_target::xfer_partial already handle making sure the remote is
pointing at the right process or thread.
Getting this out of the way helps a bit with further elimination of
the remote_state global, because we have to handle the case of a user
invoking the command even if not connect to a remote target.
gdb/ChangeLog:
2018-05-22 Pedro Alves <palves@redhat.com>
* remote.c (compare_section_command): Remove set_general_process
call.