static analyzer issues in UIImage+Resize

[core-code]

OWActivityViewController/UIImage+Resize.m:63:23: warning: Potential leak of an object CGImageRetain([self CGImage]); ^ OWActivityViewController/UIImage+Resize.m:80:26: warning: Potential leak of an object stored into 'cgImage' CGImageRef cgImage = CGBitmapContextCreateImage(context); ^ OWActivityViewController/UIImage+Resize.m:93:5: warning: Incorrect decrement of the reference count of an object that is not owned at this point by the caller CGImageRelease(imgRef); ^~~~~~~~~~~~~~~~~~~~~~ OWActivityViewController/UIImage+Resize.m:103:5: warning: Incorrect decrement of the reference count of an object that is not owned at this point by the caller CGImageRelease(imgRef); ^~~~~~~~~~~~~~~~~~~~~~ OWActivityViewController/UIImage+Resize.m:115:5: warning: Incorrect decrement of the reference count of an object that is not owned at this point by the caller CGImageRelease(imgRef); ^~~~~~~~~~~~~~~~~~~~~~ OWActivityViewController/UIImage+Resize.m:127:5: warning: Incorrect decrement of the reference count of an object that is not owned at this point by the caller CGImageRelease(imgRef); ^~~~~~~~~~~~~~~~~~~~~~ 6 warnings generated.