Fix memory leaks reported by clang static analyzer.

src/ports/SkOSFile_stdio.cpp

Index: src/ports/SkOSFile_stdio.cpp
diff --git a/src/ports/SkOSFile_stdio.cpp b/src/ports/SkOSFile_stdio.cpp
index 6d39b3afd19a44a48cdb310523d1e4571d54ef59..1c4bd4babdb3ed788f7fad4cd857e3fe9a0594c4 100644
--- a/src/ports/SkOSFile_stdio.cpp
+++ b/src/ports/SkOSFile_stdio.cpp
@@ -38,14 +38,16 @@ static FILE* ios_open_from_bundle(const char path[], const char* perm) {
 
     // 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