[Sema] Remove an unnecessary cast (NFC) (#152644)

numTypeParams is already of unsigned.

Co-authored-by: Corentin Jabot <[email protected]>

Author: kazutakahirata

clang/lib/Sema/SemaObjC.cpp

@@ -691,7 +691,7 @@ static QualType applyObjCTypeArgs(Sema &S, SourceLocation loc, QualType type,
   if (!anyPackExpansions && finalTypeArgs.size() != numTypeParams) {
     S.Diag(loc, diag::err_objc_type_args_wrong_arity)
         << (typeArgs.size() < typeParams->size()) << objcClass->getDeclName()
-        << (unsigned)finalTypeArgs.size() << (unsigned)numTypeParams;
+        << (unsigned)finalTypeArgs.size() << numTypeParams;
     S.Diag(objcClass->getLocation(), diag::note_previous_decl) << objcClass;
 
     if (failOnError)