Fixed an unsafe TBL_PC* cast in battle_calc_elefix

This would cause a mapserver crash whenever the function was called by a
monster attack.
The issue was introduced in 03956104
Merge pull request #45 from MishimaHaruna/master

Fixed an unsafe TBL_PC* cast in battle_calc_elefix
Follow up 8568f179f5cefa638d564b75119235bac4b9a3b3

Signed-off-by: shennetsind <ind@henn.et>
Merge branch 'master' of https://github.com/HerculesWS/Hercules
Merge branch 'master' of https://github.com/HerculesWS/Hercules into ghbb