Fix wild frees and leak of fs in test-conf.

Reported by AddressSanitizer when running test-conf. The `query`,
`result`, and `result_fs` were not initialized to NULL so could result
in a wild free when first initialized.

The `method` was also not initialized to NULL so comparisons could be
made against random data if it had not yet been assigned.

The outer `fs` was never destroyed, but is also not used, so remove.
10 jobs for test_conf_xsan in 11 minutes and 9 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Build
passed #6167812
gst-macos-10.15
meson macos

00:04:55

passed #6167809
meson-mingw-w64-build

00:06:40

manual #6167813
docker windows 1809 allowed to fail manual
meson msys2
passed #6167807
meson-shared-build

00:06:00

passed #6167808
meson-static-build

00:05:49

passed #6167810
docker windows 1809
meson vs2017 amd64

00:02:18

passed #6167811
docker windows 1809
meson vs2017 x86

00:02:19

passed #6167806
mingw-build

00:10:57

passed #6167804
shared-build

00:07:20

passed #6167805
static-build

00:05:56