playlist lost when disk is full after game is started

Description

when the disk which contains the retroarch home dir and it's lpl database files is full, loading any game will result in a deleted playlist.

Expected behavior

after loading a game from a playlist, the playlist should stay available even when the disk is currently full.

Actual behavior

after selecting a game, retroarch seems to want to update the playlist file with "number of times played" or a similar information, and when the disk is full writing the file back fails, leaving it empty.

Steps to reproduce the bug

1. put full mame rom set (zip in zip!) on the slow SD card in your raspberry pi
2. scan the directory containing it
3. come back to the pi 24 hours laters when retroarch has hopefully finished writing the MAME playlist.
4. in a terminal, type: dd if=/dev/zero of=$HOME/.config/retroarch/filler.dat bs=1M
5. start retroarch
6. wait until dd task finishes when disk/SD card is full
7. select a game in your mame playlist, run it
8. quit the game and go back to your mame playlist - it is now empty!

alternative smaller steps to reproduce

1. create a manual playlist with 1 game
2. continue with point 4 above

Version/Commit

You can find this information under Information/System Information

• RetroArch: 1.19.1

Environment information

• OS: Linux/X11
• Compiler: not relevant

Reproduce the failure using the RetroArch playlist under ~/.config/retroarch and a full disk, then trace the playlist update performed after launching a game. Verify that a failed write does not leave the .lpl file empty, and repeat the reproduction steps to confirm the playlist remains available.