cam: file_sink: Workaround gcc-13 dangling-reference false positive

A new warning has been introduced to gcc-13 that produces a false
positive on the cam file sink object:

src/cam/file_sink.cpp:92:45: error: possibly dangling reference to a temporary [-Werror=dangling-reference]
   92 |                 const FrameMetadata::Plane &meta = buffer->metadata().planes()[i];
      |                                             ^~~~
src/cam/file_sink.cpp:92:81: note: the temporary was destroyed at the end of the full expression '(& buffer->libcamera::FrameBuffer::metadata())->libcamera::FrameMetadata::planes().libcamera::Span<const libcamera::FrameMetadata::Plane>::operator[](i)'
   92 |                 const FrameMetadata::Plane &meta = buffer->metadata().planes()[i];
      |                                                                                 ^
cc1plus: all warnings being treated as errors

Workaround this issue by refactoring the code to take a local const
copy of the bytesused value, rather than a local const reference to the
plane.

Bug: https://bugs.libcamera.org/show_bug.cgi?id=185
Bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107532
Co-developed-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Eric Curtin <ecurtin@redhat.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
[Kieran: Commit and comment reworded prior to merge]
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

0 files changed, 0 insertions, 0 deletions