Fix memory leaks 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 20 matching lines @@
     // 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);
+    CFRelease(imageURL);
 
     // Get the system encoding method
     CFStringEncoding encodingMethod = CFStringGetSystemEncoding();
 
     // Convert the string reference into a C string
     const char *finalPath = CFStringGetCStringPtr(imagePath, encodingMethod);
-
-    return fopen(finalPath, perm);
+    FILE* fileHandle = fopen(finalPath, perm);
+    CFRelease(imagePath);
+    return fileHandle;
 }
 #endif
 
 
 FILE* sk_fopen(const char path[], SkFILE_Flags flags) {
     char    perm[4];
     char*   p = perm;
 
     if (flags & kRead_SkFILE_Flag) {
         *p++ = 'r';
@@ skipping 145 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;
     }
 }