Fix build

Author: lukebakken

projects/RabbitMQ.Client/client/impl/WireFormatting.cs

@@ -32,6 +32,7 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.Runtime.CompilerServices;
 using System.Text;
 
 using RabbitMQ.Client.Exceptions;
@@ -72,6 +73,7 @@ internal DecimalData(uint flags, uint hi, uint lo, uint mid)
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static decimal ReadDecimal(ReadOnlySpan<byte> span)
         {
+            byte scale = span[0];
             if (scale > 28)
             {
                 ThrowInvalidDecimalScale(scale);
@@ -120,13 +122,6 @@ public static IList ReadArray(ReadOnlySpan<byte> span, out int bytesRead)
             return array;
         }
 
-        public static decimal ReadDecimal(ReadOnlySpan<byte> span)
-        {
-            byte scale = span[0];
-            uint unsignedMantissa = NetworkOrderDeserializer.ReadUInt32(span.Slice(1));
-            return AmqpToDecimal(scale, unsignedMantissa);
-        }
-
         public static object ReadFieldValue(ReadOnlySpan<byte> span, out int bytesRead)
         {
             bytesRead = 1;