linux-nat.c (linux_nat_wait_1): Make local prev_mask non-static.

gdb/ChangeLog:

	linux-nat.c (linux_nat_wait_1): Make local prev_mask non-static.
Fix some comments to say minus_one_ptid instead of PID == -1.

gdb/ChangeLog:

	* gdbthread.h (set_running): Fix comment.
	(set_executing, finish_thread_state): Fix comment.
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