Change InputMessage.motion.pointerSize to a uint32_t.

This ensures it's the same size in both 32 and 64 bit
processes and also brings it in line with struct
MotionEntry.

Change-Id: I66bb8b8d8664763e7dcbd489686051f563d5e1dc
diff --git a/services/inputflinger/InputDispatcher.cpp b/services/inputflinger/InputDispatcher.cpp
index 0bae399..a750a3d 100644
--- a/services/inputflinger/InputDispatcher.cpp
+++ b/services/inputflinger/InputDispatcher.cpp
@@ -1965,7 +1965,7 @@
                 xOffset = dispatchEntry->xOffset * scaleFactor;
                 yOffset = dispatchEntry->yOffset * scaleFactor;
                 if (scaleFactor != 1.0f) {
-                    for (size_t i = 0; i < motionEntry->pointerCount; i++) {
+                    for (uint32_t i = 0; i < motionEntry->pointerCount; i++) {
                         scaledCoords[i] = motionEntry->pointerCoords[i];
                         scaledCoords[i].scale(scaleFactor);
                     }
@@ -1978,7 +1978,7 @@
 
                 // We don't want the dispatch target to know.
                 if (dispatchEntry->targetFlags & InputTarget::FLAG_ZERO_COORDS) {
-                    for (size_t i = 0; i < motionEntry->pointerCount; i++) {
+                    for (uint32_t i = 0; i < motionEntry->pointerCount; i++) {
                         scaledCoords[i].clear();
                     }
                     usingCoords = scaledCoords;