[3171580] don't automatically log GraphicBuffer allocation failures

some of these failures are not fatal and even expected in some cases
so they should not emit a dump in the log in those cases.

Change-Id: Idcfa252e3bfa9d74e27fe4ad8f8623aa01aa9c5e
diff --git a/libs/ui/GraphicBufferAllocator.cpp b/libs/ui/GraphicBufferAllocator.cpp
index d51664d..fa46ab7 100644
--- a/libs/ui/GraphicBufferAllocator.cpp
+++ b/libs/ui/GraphicBufferAllocator.cpp
@@ -73,6 +73,13 @@
     result.append(buffer);
 }
 
+void GraphicBufferAllocator::dumpToSystemLog()
+{
+    String8 s;
+    GraphicBufferAllocator::getInstance().dump(s);
+    LOGD("%s", s.string());
+}
+
 status_t GraphicBufferAllocator::alloc(uint32_t w, uint32_t h, PixelFormat format,
         int usage, buffer_handle_t* handle, int32_t* stride)
 {
@@ -104,10 +111,6 @@
         rec.usage = usage;
         rec.size = h * stride[0] * bytesPerPixel(format);
         list.add(*handle, rec);
-    } else {
-        String8 s;
-        dump(s);
-        LOGD("%s", s.string());
     }
 
     return err;