
The exfat_fs_exists() should return 0 in case the path does not exist,
and 1 in case the path does exist. Fix the inverted return value. This
fixes 'test -e' command with exfat.
Fixes: b86a651b64
("fs: exfat: Add U-Boot porting layer")
Signed-off-by: Marek Vasut <marex@denx.de>