pipewire-v4l2: actually close file descriptors

Close every file descriptor of a given `struct file` object
in `v4l2_close()` apart from the "main" file descriptor.
34 jobs for pw_v4l2_impr in 6 minutes and 10 seconds (queued for 4 minutes and 40 seconds)
Status Name Job ID Coverage
  Container
passed container_fedora #14750979

00:00:24

passed container_ubuntu #14750978

00:00:30

 
  Build
passed build_on_fedora #14750981

00:00:50

passed build_on_ubuntu #14750980

00:01:02

passed build_release: [clang] #14751007

00:00:42

passed build_release: [gcc] #14751006

00:01:09

passed build_with_custom_options: [audiotestsrc, disabled] #14750993

00:01:03

passed build_with_custom_options: [audiotestsrc, enabled] #14750992

00:00:58

passed build_with_custom_options: [bluez5-backend-hsphfpd, disabled] #14750991

00:00:40

passed build_with_custom_options: [bluez5-backend-hsphfpd, enabled] #14750990

00:00:36

passed build_with_custom_options: [docs, disabled] #14750985

00:00:57

passed build_with_custom_options: [docs, enabled] #14750984

00:01:18

passed build_with_custom_options: [installed_tests, disabled] #14750987

00:00:56

passed build_with_custom_options: [installed_tests, enabled] #14750986

00:01:05

passed build_with_custom_options: [sdl2, disabled] #14751003

00:00:46

passed build_with_custom_options: [sdl2, enabled] #14751002

00:00:59

passed build_with_custom_options: [sndfile, disabled] #14751005

00:00:36

passed build_with_custom_options: [sndfile, enabled] #14751004

00:00:50

passed build_with_custom_options: [systemd-system-service, disabled] #14750989

00:01:01

passed build_with_custom_options: [systemd-system-service, enabled] #14750988

00:01:04

passed build_with_custom_options: [test, disabled] #14750995

00:00:45

passed build_with_custom_options: [test, enabled] #14750994

00:00:48

passed build_with_custom_options: [videotestsrc, disabled] #14750997

00:00:46

passed build_with_custom_options: [videotestsrc, enabled] #14750996

00:01:09

passed build_with_custom_options: [volume, disabled] #14750999

00:00:43

passed build_with_custom_options: [volume, enabled] #14750998

00:01:02

passed build_with_custom_options: [vulkan, disabled] #14751001

00:00:59

passed build_with_custom_options: [vulkan, enabled] #14751000

00:01:02

passed build_with_no_commandline_options: [clang] #14750983

00:01:00

passed build_with_no_commandline_options: [gcc] #14750982

00:00:54

passed valgrind #14751008

00:00:37

 
  Analysis
passed doccheck #14751011

00:00:57

passed shellcheck #14751009

00:00:45

passed spellcheck #14751010

00:01:46