[clang][OpenMP][NFC] Remove unnecessary nullptr check (#94680)

Static verifier reports unchecked use of pointer after explicitly
checking earlier in the function. It appears the pointer won't be a
nullptr, so remove the unneeded check for consistency.

Author: mikerice1969

clang/lib/Sema/SemaOpenMP.cpp

@@ -6198,18 +6198,17 @@ class TeamsLoopChecker final : public ConstStmtVisitor<TeamsLoopChecker> {
     // unless the assume-no-nested-parallelism flag has been specified.
     // OpenMP API runtime library calls do not inhibit parallel loop
     // translation, regardless of the assume-no-nested-parallelism.
-    if (C) {
-      bool IsOpenMPAPI = false;
-      auto *FD = dyn_cast_or_null<FunctionDecl>(C->getCalleeDecl());
-      if (FD) {
-        std::string Name = FD->getNameInfo().getAsString();
-        IsOpenMPAPI = Name.find("omp_") == 0;
-      }
-      TeamsLoopCanBeParallelFor =
-          IsOpenMPAPI || SemaRef.getLangOpts().OpenMPNoNestedParallelism;
-      if (!TeamsLoopCanBeParallelFor)
-        return;
-    }
+    bool IsOpenMPAPI = false;
+    auto *FD = dyn_cast_or_null<FunctionDecl>(C->getCalleeDecl());
+    if (FD) {
+      std::string Name = FD->getNameInfo().getAsString();
+      IsOpenMPAPI = Name.find("omp_") == 0;
+    }
+    TeamsLoopCanBeParallelFor =
+        IsOpenMPAPI || SemaRef.getLangOpts().OpenMPNoNestedParallelism;
+    if (!TeamsLoopCanBeParallelFor)
+      return;
+
     for (const Stmt *Child : C->children())
       if (Child)
         Visit(Child);