[Sema][NFC] Remove Redundant Condition

Condition `TypeQuals` is checked both in an outer and in an inner `if`
statement in static function `ConvertDeclSpecToType()` in file
`SemaType.cpp`. This patch removes the redundant inner check.

The issue was found using `clang-tidy` check under review
`misc-redundant-condition`. See https://reviews.llvm.org/D81272.

Differential Revision: https://reviews.llvm.org/D82563

clang/lib/Sema/SemaType.cpp

@@ -1759,7 +1759,7 @@ static QualType ConvertDeclSpecToType(TypeProcessingState &state) {
     //   The effect of a cv-qualifier-seq in a function declarator is not the
     //   same as adding cv-qualification on top of the function type. In the
     //   latter case, the cv-qualifiers are ignored.
-    if (TypeQuals && Result->isFunctionType()) {
+    if (Result->isFunctionType()) {
       diagnoseAndRemoveTypeQualifiers(
           S, DS, TypeQuals, Result, DeclSpec::TQ_const | DeclSpec::TQ_volatile,
           S.getLangOpts().CPlusPlus