Fix a few nits found by PVS Studio

src/deoptimizer.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/disasm.h"
@@ skipping 675 matching lines @@
   return base->area_start() + (id * table_entry_size_);
 }
 
 
 int Deoptimizer::GetDeoptimizationId(Isolate* isolate,
                                      Address addr,
                                      BailoutType type) {
   DeoptimizerData* data = isolate->deoptimizer_data();
   MemoryChunk* base = data->deopt_entry_code_[type];
   Address start = base->area_start();
-  if (base == NULL ||
-      addr < start ||
+  if (addr < start ||
       addr >= start + (kMaxNumberOfEntries * table_entry_size_)) {
     return kNotDeoptimizationEntry;
   }
   DCHECK_EQ(0,
             static_cast<int>(addr - start) % table_entry_size_);
   return static_cast<int>(addr - start) / table_entry_size_;
 }
 
 
 int Deoptimizer::GetOutputInfo(DeoptimizationOutputData* data,
@@ skipping 2920 matching lines @@
 
 
 void DeoptimizedFrameInfo::Iterate(ObjectVisitor* v) {
   v->VisitPointer(bit_cast<Object**>(&function_));
   v->VisitPointer(&context_);
   v->VisitPointers(parameters_, parameters_ + parameters_count_);
   v->VisitPointers(expression_stack_, expression_stack_ + expression_count_);
 }
 
 } }  // namespace v8::internal