Remove warning when associated display is ADISPLAY_ID_NONE.

This warning caused logspam in emulator system image because emulator
host pre-registeris several touch screen devices which are not associated
with any display until multi-display feature is turned on. Unfortunately,
there is no easy way to add/remove touch screen device on-demand in
emulator host at runtime.

Bug: 160609749

Signed-off-by: Weilun Du <wdu@google.com>
Change-Id: I78d8c1b18285a58887b107d5469f9d1703132b44
diff --git a/services/inputflinger/reader/InputReader.cpp b/services/inputflinger/reader/InputReader.cpp
index 0b632f7..30f25e5 100644
--- a/services/inputflinger/reader/InputReader.cpp
+++ b/services/inputflinger/reader/InputReader.cpp
@@ -782,12 +782,8 @@
 
     std::optional<int32_t> associatedDisplayId = device->getAssociatedDisplayId();
     // No associated display. By default, can dispatch to all displays.
-    if (!associatedDisplayId) {
-        return true;
-    }
-
-    if (*associatedDisplayId == ADISPLAY_ID_NONE) {
-        ALOGW("Device %s is associated with display ADISPLAY_ID_NONE.", device->getName().c_str());
+    if (!associatedDisplayId ||
+            *associatedDisplayId == ADISPLAY_ID_NONE) {
         return true;
     }