public void releaseFileSystemImmediate(FileSystemRef fsRef) {
		if (fsRef != null && !fsRef.isClosed()) {
			fsInstanceManager.releaseImmediate(fsRef);
		}
	}
Releases the specified {@link FileSystemRef}, and if no other references remain, removes 
it from the shared cache of file system instances.

@param fsRef the ref to release
Ghidra/Features/Base/src/main/java/ghidra/formats/gfilesystem/FileSystemService.java