[RFA] Fix two memory leaks

[Keith Seitz]

Hi,

While testing some recent work, I noticed that valgrind was reporting 
two memory leaks related to linespec parsing/SaL resolution.

The following patch fixes both leaks.

Keith

ChangeLog
2012-10-23  Keith Seitz  <keiths@redhat.com>

	* breakpoint.c (clear_command): Add cleanup for
	sals.sals if an argument is given.

	* linespec.c (parse_linespec): Do cleanups after
	parsing a convenience variable.

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