Fix typo in TryExpandTypeEquality (#99101)

Fixes #99047

Author: jkotas

src/coreclr/tools/aot/ILCompiler.Compiler/Compiler/SubstitutedILProvider.cs

@@ -879,7 +879,7 @@ private static bool TryExpandTypeEquality(MethodIL methodIL, byte[] body, Opcode
                 return false;
 
             TypeDesc type2 = ReadLdToken(ref reader, methodIL, flags);
-            if (type1 == null)
+            if (type2 == null)
                 return false;
 
             if (!ReadGetTypeFromHandle(ref reader, methodIL, flags))