[Clang][Sema][NFC] Remove duplicate check in if-condition (llvm#101070)

Resolves llvm#101041

Author: DeinAlptraum

clang/lib/Sema/SemaOpenMP.cpp

@@ -23087,8 +23087,7 @@ OMPClause *SemaOpenMP::ActOnOpenMPDoacrossClause(
   if (DSAStack->getCurrentDirective() == OMPD_ordered &&
       DepType != OMPC_DOACROSS_source && DepType != OMPC_DOACROSS_sink &&
       DepType != OMPC_DOACROSS_sink_omp_cur_iteration &&
-      DepType != OMPC_DOACROSS_source_omp_cur_iteration &&
-      DepType != OMPC_DOACROSS_source) {
+      DepType != OMPC_DOACROSS_source_omp_cur_iteration) {
     Diag(DepLoc, diag::err_omp_unexpected_clause_value)
         << "'source' or 'sink'" << getOpenMPClauseName(OMPC_doacross);
     return nullptr;