gnucash maint: Close some more memory leaks

[Phil Longstaff]

Updated	 via  https://github.com/Gnucash/gnucash/commit/97b7c265 (commit)
	from  https://github.com/Gnucash/gnucash/commit/40c543ef (commit)



commit 97b7c26570092d8651f7ea391029ab88fc2cee26
Author: Phil Longstaff <phil.longstaff at yahoo.ca>
Date:   Sun Feb 28 07:31:03 2016 -0500

    Close some more memory leaks



Summary of changes:
 src/app-utils/gnc-state.c                   |  3 ++-
 src/core-utils/gnc-filepath-utils.c         |  4 ++--
 src/gnome-utils/gnc-plugin-menu-additions.c | 12 ++++++++++++
 3 files changed, 16 insertions(+), 3 deletions(-)