LibNX - MSU-1-enabled ROMs double launch failure

[SeongGino]

Issue:

Any compatible ROMsets with MSU-1 data attached to it will crash the system when more than one MSU-1 enabled ROM is launched.

Steps to reproduce:

1. Load an MSU-1 enabled SNES game, using SNES9x (mainline, not 2010).
2. Close content, then load either the same or otherwise similar MSU-1 enabled SNES game, using SNES9x.

This will result in a system-level crash (2168-0002, a generic LibNX error), that cannot be recovered from without rebooting the system.

Tested on:

RetroArch: 1.7.5 (LibNX version)

Notes:

This has been noted to occur even on previously-MSU-1 compatible builds of SNES9x. It will still occur regardless, despite said ROMs displaying purely a black screen.

This only applies to the LibNX version of RetroArch for Nintendo Switch, and is not a core issue acknowledged on other platforms (I.E. x86_64, ARM, etc.). This has been tested using Homebrew Launcher as a system application, meaning RetroArch has a total ~400MB available RAM to use. This issue has been noted since before the official RetroArch for Nintendo Switch release (formerly known as "RetroNX").