lpbin: Fix a thumbnail extraction bug
lpbin: Fix a thumbnail extraction bug

http://hlm.lge.com/issue/browse/MSPART-154

Change-Id: If0e0bb59578252578abbc10b478fc6db6c82482b
Reviewed-on: https://gpro.palm.com/12481
Reviewed-by: Jeongseok Kim <0c03ab7a1b32f29697716389c3f9549845834271@lge.com>
Tested-by: Jeongseok Kim <0c03ab7a1b32f29697716389c3f9549845834271@lge.com>

justinjoy/gst-plugins-lp,justinjoy/gst-plugins-lp