Fix potential division by zero in OpenYuvFile

If width or height is 0, the calculation i420_frame_size becomes 0, leading to a crash when dividing file_size by it.

Also moved the dimension check to the top to prevent file handle leaks, and added a missing fclose in the even/odd check

Bug: None
Change-Id: I1fd1d2cb3c5fe515f685be15b6c60bd8ae761cf4
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/447062
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#46853}