gdb: fix nits in previous patches

gdb: fix nits in previous patches

I forgot to fix some nits pointed out in review before merging the
"frame inlined in outer frame series", this patch fixes them.

gdb/ChangeLog:

	* frame-unwind.h (frame_prev_register_ftype): Fix adjective
	ordering in comment.
	* frame.c (frame_id_eq): Fix indentation.

gdb/testsuite/ChangeLog:

	* gdb.dwarf2/dw2-reg-undefined.exp: Remove spurious #.

Change-Id: Iaddde9677fc3f68382558d1a16f5a0b4beb78bac