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[binutils-gdb] btrace: improve enable error messages


*** TEST RESULTS FOR COMMIT 17ad2a4f466f22b7a75b5ebf8a68446bb328c40c ***

Author: Markus Metzger <markus.t.metzger@intel.com>
Branch: master
Commit: 17ad2a4f466f22b7a75b5ebf8a68446bb328c40c

btrace: improve enable error messages

Improve the error message when GDB fails to start recording branch trace.

This patch also removes a zero buffer size check for PT to align with BTS.  The
buffer size can not be configured to be zero.

gdb/
	* nat/linux-btrace.c (perf_event_pt_event_type): Improve error message.
	Remove parameter and change return type.  Update callers.  Move it.
	(linux_enable_bts, linux_enable_pt): Improve error message.
	(linux_enable_pt): Remove zero buffer size check.
	(linux_enable_btrace): Improve error messages.  Remove NULL return
	check.


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