[patch] Small fixes to source file handling

[Fernando Nasser]

This is to fix a couple of things that Andrew Cagney found in my 
previous patch and the first part of some code clean-ups he suggested.

Checked in:

	* source.c (get_current_source_symtab_and_line): Initialize sal.pc and
	sal.end fields.
	(get_current_or_default_source_symtab_and_line): Ditto.
	* breakpoint.c (parse_breakpoint_sals): Use correct accessor function
	so we do not cause a new source symtab to be searched for (reverting an
	unintentional change from the 2002-09-20 patch).
	* scm-lang.c (scm_unpac): Ditto.


-- 
Fernando Nasser
Red Hat Canada Ltd.                     E-Mail:  fnasser@redhat.com
2323 Yonge Street, Suite #300
Toronto, Ontario   M4P 2C9
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