[Ada] Refine type for checking number of pragma arguments

[Pierre-Marie de Rodat <derodat@adacore.com>]

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Code cleanup.

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

gcc/ada/

	* par-prag.adb (Check_Arg_Count): Change parameter type from Int
	to Nat, because this parameter is compared to Arg_Count variable
	which is of type Nat. Also, it wouldn't make sense to check for
	negative number of pragma arguments.

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diff --git a/gcc/ada/par-prag.adb b/gcc/ada/par-prag.adb
--- a/gcc/ada/par-prag.adb
+++ b/gcc/ada/par-prag.adb
@@ -65,7 +65,7 @@ function Prag (Pragma_Node : Node_Id; Semi : Source_Ptr) return Node_Id is
    --  the routine for the argument one past the last present argument, but
    --  that is the only case in which a non-present argument can be referenced.
 
-   procedure Check_Arg_Count (Required : Int);
+   procedure Check_Arg_Count (Required : Nat);
    --  Check argument count for pragma = Required. If not give error and raise
    --  Error_Resync.
 
@@ -155,7 +155,7 @@ function Prag (Pragma_Node : Node_Id; Semi : Source_Ptr) return Node_Id is
    -- Check_Arg_Count --
    ---------------------
 
-   procedure Check_Arg_Count (Required : Int) is
+   procedure Check_Arg_Count (Required : Nat) is
    begin
       if Arg_Count /= Required then
          Error_Msg_N ("wrong number of arguments for pragma%", Pragma_Node);