switch cpu flags to 0 for unitialized to avoid compare

source/cpu_id.cc

 /*
  *  Copyright 2011 The LibYuv 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 in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS. All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 156 matching lines @@
       return kCpuHasMIPS_DSP;
     }
   }
   fclose(f);
   return 0;
 }
 #endif
 
 // CPU detect function for SIMD instruction sets.
 LIBYUV_API
-int cpu_info_ = kCpuInit;  // cpu_info is not initialized yet.
+int cpu_info_ = 0;  // cpu_info is not initialized yet.
 
 // Test environment variable for disabling CPU features. Any non-zero value
 // to disable. Zero ignored to make it easy to set the variable on/off.
 #if !defined(__native_client__) && !defined(_M_ARM)
 
 static LIBYUV_BOOL TestEnv(const char* name) {
   const char* var = getenv(name);
   if (var) {
     if (var[0] != '0') {
       return LIBYUV_TRUE;
@@ skipping 96 matching lines @@
   cpu_info = ArmCpuCaps("/proc/cpuinfo");
 #endif
   cpu_info |= kCpuHasARM;
   if (TestEnv("LIBYUV_DISABLE_NEON")) {
     cpu_info &= ~kCpuHasNEON;
   }
 #endif  // __arm__
   if (TestEnv("LIBYUV_DISABLE_ASM")) {
     cpu_info = 0;
   }
+  cpu_info  |= kCpuInitialized;
   cpu_info_ = cpu_info;
-  return cpu_info_;
+  return cpu_info;
 }
 
 // Note that use of this function is not thread safe.
 LIBYUV_API
 void MaskCpuFlags(int enable_flags) {
   cpu_info_ = InitCpuFlags() & enable_flags;
 }
 
 #ifdef __cplusplus
 }  // extern "C"
 }  // namespace libyuv
 #endif