Fix failing RippleShaderTest

Bug: 270197061
Test: atest RippleShaderTest
Change-Id: I171d8c43aaf6fc087dc3fac032e7177e65c5aa6a

packages/SystemUI/animation/src/com/android/systemui/surfaceeffects/ripple/RippleShader.kt

@@ -431,8 +431,9 @@ class RippleShader(rippleShape: RippleShape = RippleShape.CIRCLE) :
                             "[setSizeAtProgresses] before playing the animation."
                     )
                 }
-                // If there's no size is set, we set everything to 0.
+                // If there's no size is set, we set everything to 0 and return early.
                 setSizeAtProgresses(initialSize)
+                return currentSizeIndex
             }
 
             var candidate = sizes[currentSizeIndex]