avfilter/graphparser: Directly free filter memory if initialization fails
Remove #undefs for formerly forbidden system functions

The macros forbidding the system functions no longer exist, obviating
the need for the #undefs.
Merge commit 'cffecc0e7ebd642afaa1fb9f56fab1fcc283293c'

* commit 'cffecc0e7ebd642afaa1fb9f56fab1fcc283293c':
  avfilter/graphparser: Directly free filter memory if initialization fails

Conflicts:
	libavfilter/graphparser.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
avfilter/graphparser: zero filter_ctx in case of deallocation in create_filter()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  Remove #undefs for formerly forbidden system functions

Merged-by: Michael Niedermayer <michaelni@gmx.at>
libavcodec/dvdsubdec: remove exit() call in debug code

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>