libbinder_ndk: remove logspam on incStrong

AIBinder_incStrong is frequently called on a null binder out of
convenience, because in cases where ownership is required on a binder
that may or may not be nullptr, ignoring the incStrong on nullptr is
consistent.

Fixes: 150894288
Test: atest CtsNdkBinderTestCases
Change-Id: I247811a7d4600711c015647f77900bf3183890e2
(cherry picked from commit 42666b84bcdb268cd2e474eb7024a32651cc07c6)
Merged-In: I247811a7d4600711c015647f77900bf3183890e2
diff --git a/libs/binder/ndk/ibinder.cpp b/libs/binder/ndk/ibinder.cpp
index 75dcdc8..649faa1 100644
--- a/libs/binder/ndk/ibinder.cpp
+++ b/libs/binder/ndk/ibinder.cpp
@@ -486,7 +486,6 @@
 
 void AIBinder_incStrong(AIBinder* binder) {
     if (binder == nullptr) {
-        LOG(ERROR) << __func__ << ": on null binder";
         return;
     }