Fix error in InefficientWeight rule. It would wrongly assume 0dip != 0dip.

Change-Id: I2ab9b3c6b57744563c87cb8457c55afd0cbfcb57

tools/layoutopt/libs/uix/src/resources/rules/InefficientWeight.rule

@@ -12,7 +12,7 @@ if (parent.is("LinearLayout") && node.'@android:layout_weight' &&
         parent.'*'.findAll{ it.'@android:layout_weight' }.size() == 1) {
     def dimension = parent.'@android:orientation' == "vertical" ?
         "android:layout_height" : "android:layout_width"
-    if (node."@${dimension}"[0] != 0) {
+    if (node."@${dimension}"[0] != '0') {
         analysis << "Use an ${dimension} of 0dip instead of ${node."@${dimension}"} " +
                 "for better performance"
     }

tools/layoutopt/samples/inefficient_weight.xml

@@ -25,5 +25,20 @@
 		 	android:layout_weight="1.0" />
 
 	</LinearLayout>
+	
+	<LinearLayout
+	    xmlns:android="http://schemas.android.com/apk/res/android"
+
+	    android:layout_width="fill_parent"
+	    android:layout_height="fill_parent"
+	
+		android:orientation="vertical">
+
+		<Button 
+		    android:layout_width="fill_parent"
+		    android:layout_height="0dip"
+		 	android:layout_weight="1.0" />
+
+	</LinearLayout>
 
 </LinearLayout>