Fix a memory leak reported by clang static analyzer.

src/ports/SkOSFile_stdio.cpp

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkOSFile.h"
 #include "SkTypes.h"
 
@@ skipping 13 matching lines @@
 #ifdef SK_BUILD_FOR_IOS
 #import <CoreFoundation/CoreFoundation.h>
 
 static FILE* ios_open_from_bundle(const char path[], const char* perm) {
     // Get a reference to the main bundle
     CFBundleRef mainBundle = CFBundleGetMainBundle();
 
     // Get a reference to the file's URL
     CFStringRef pathRef = CFStringCreateWithCString(NULL, path, kCFStringEncodingUTF8);
     CFURLRef imageURL = CFBundleCopyResourceURL(mainBundle, pathRef, NULL, NULL);
+    CFRelease(pathRef);
     if (!imageURL) {
         return nullptr;
     }
 
     // Convert the URL reference into a string reference
     CFStringRef imagePath = CFURLCopyFileSystemPath(imageURL, kCFURLPOSIXPathStyle);
 
     // Get the system encoding method
     CFStringEncoding encodingMethod = CFStringGetSystemEncoding();
 
@@ skipping 159 matching lines @@
 #else
     retval = mkdir(path, 0777);
 #endif
     if (0 == retval) {
         return true;
     } else {
         fprintf(stderr, "sk_mkdir: error %d creating dir '%s'\n", errno, path);
         return false;
     }
 }