We free the mainloop but didn't check validity before calling lock or
unlock. Also we might need to unlock the main loop before freeing
it in some other error cases.
Change-Id: Iadf1049324cdf37ca9841b82e53e33afdcba8cb2
Reviewed-by: Jun Zhu <jun.5.zhu@nokia.com>
Reviewed-by: Lev Zelenskiy <lev.zelenskiy@nokia.com>
Reviewed-by: Dmytro Poplavskiy <dmytro.poplavskiy@nokia.com>