gcc 4.6 reports:
  demux.c: In function HandleSection:
  demux.c:2267:61: warning: f may be used uninitialized in this function [-Wuninitialized]
  demux.c:2261:26: note: f was declared here

The gcc is correct that f is used initialized which is real bug in
this case.
Signed-off-by: Georgi Chorbadzhiyski <gf@unixsol.org>