Fix example code
Fix example code

Fix too many arguments to function 'cw_pack_context_init'
Fix too many arguments to function 'cw_unpack_context_init'
Fix too many closing brackets ')'
clwi/CWPack,GPUOpen-Drivers/CWPack,clwi/CWPack,clwi/CWPack,GPUOpen-Drivers/CWPack