Added newline at end of file, http://rathena.org/board/tracker/issue-8380-warnings-warnings/

Signed-off-by: Cydh Ramdh <house.bad@gmail.com>

src/common/atomic.h

@@ -144,4 +144,4 @@ static forceinline int32 InterlockedExchange(volatile int32 *target, int32 val){
 #endif //endif compiler decission
 
 
-#endif
+#endif