Remove dead code

'this' pointer cannot be null; comparison would always evaluate to
false. Delete the dead code.

Test: m checkbuild
Change-Id: Idb44753b775ed51918c19be64f8d14b0b7a20daf
diff --git a/libs/ui/GraphicBuffer.cpp b/libs/ui/GraphicBuffer.cpp
index c880500..2124dc6 100644
--- a/libs/ui/GraphicBuffer.cpp
+++ b/libs/ui/GraphicBuffer.cpp
@@ -122,7 +122,6 @@
 
 ANativeWindowBuffer* GraphicBuffer::getNativeBuffer() const
 {
-    LOG_ALWAYS_FATAL_IF(this == NULL, "getNativeBuffer() called on NULL GraphicBuffer");
     return static_cast<ANativeWindowBuffer*>(
             const_cast<GraphicBuffer*>(this));
 }