Analysis: Resolve type mismatch type warning for app module

Warning Message: "Type mismatch: inferred type is Bitmap? but Bitmap was
expected"

Author: ParaskP7

app/src/main/kotlin/org/wordpress/aztec/demo/MainActivity.kt

@@ -253,15 +253,13 @@ open class MainActivity : AppCompatActivity(),
 
     override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
         if (resultCode == Activity.RESULT_OK) {
-            var bitmap: Bitmap
-
             when (requestCode) {
                 REQUEST_MEDIA_CAMERA_PHOTO -> {
                     // By default, BitmapFactory.decodeFile sets the bitmap's density to the device default so, we need
                     //  to correctly set the input density to 160 ourselves.
                     val options = BitmapFactory.Options()
                     options.inDensity = DisplayMetrics.DENSITY_DEFAULT
-                    bitmap = BitmapFactory.decodeFile(mediaPath, options)
+                    val bitmap = BitmapFactory.decodeFile(mediaPath, options)
                     insertImageAndSimulateUpload(bitmap, mediaPath)
                 }
                 REQUEST_MEDIA_PHOTO -> {
@@ -271,7 +269,7 @@ open class MainActivity : AppCompatActivity(),
                     //  to correctly set the input density to 160 ourselves.
                     val options = BitmapFactory.Options()
                     options.inDensity = DisplayMetrics.DENSITY_DEFAULT
-                    bitmap = BitmapFactory.decodeStream(stream, null, options)
+                    val bitmap = BitmapFactory.decodeStream(stream, null, options)
 
                     insertImageAndSimulateUpload(bitmap, mediaPath)
                 }
@@ -287,7 +285,7 @@ open class MainActivity : AppCompatActivity(),
 
                         override fun onThumbnailLoaded(drawable: Drawable?) {
                             val conf = Bitmap.Config.ARGB_8888 // see other conf types
-                            bitmap = Bitmap.createBitmap(drawable!!.intrinsicWidth, drawable.intrinsicHeight, conf)
+                            val bitmap = Bitmap.createBitmap(drawable!!.intrinsicWidth, drawable.intrinsicHeight, conf)
                             val canvas = Canvas(bitmap)
                             drawable.setBounds(0, 0, canvas.width, canvas.height)
                             drawable.draw(canvas)