Change order of error message printed when gdbserver can't find CWD

Change order of error message printed when gdbserver can't find CWD

I forgot to address Pedro's comment about my last patch and change the
order of the message printed when getcwd returns NULL on gdbserver.
This obvious commit does it.

gdb/gdbserver/ChangeLog:
2018-02-28  Sergio Durigan Junior  <sergiodj@redhat.com>

	* server.c (captured_main): Change order of error message printed
	when the current working directory cannot be found.