When flagging names of volatile objects occurring in actual parameters
we guard against identifiers without entity. This is redundant, because
earlier in the resolution of actual parameters we already guard against
actuals with Any_Type.

Code cleanup related to handling of volatile components; behaviour is
unaffected.

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

	* sem_res.adb (Flag_Effectively_Volatile_Objects): Remove
	redundant guard.