[Ada] Sem_Ch13: fix uninitialized parameter static analysis warning

No functional change.

2019-08-20  Bob Duff  <duff@adacore.com>

gcc/ada/

	* sem_ch13.adb (Record_Hole_Check): Initialize After_Last.

From-SVN: r274719

gcc/ada/ChangeLog

+2019-08-20  Bob Duff  <duff@adacore.com>
+
+	* sem_ch13.adb (Record_Hole_Check): Initialize After_Last.
+
 2019-08-20  Piotr Trojanek  <trojanek@adacore.com>
 
 	* impunit.adb (Get_Kind_Of_Unit): Revert change for adapting

gcc/ada/sem_ch13.adb

@@ -10438,6 +10438,8 @@ package body Sem_Ch13 is
             Sbit := Uint_0;
          end if;
 
+         After_Last := Uint_0;
+
          if Nkind (Decl) = N_Full_Type_Declaration then
             Record_Definition := Type_Definition (Decl);