fix typo that prevented proper loging of EGL error code

needed for investigating 7309949

Bug: 7309949
Change-Id: If29a5c08d0e87f46b44ba2e1030be61cb4d1403b
diff --git a/services/surfaceflinger/DisplayDevice.cpp b/services/surfaceflinger/DisplayDevice.cpp
index ff1af83..40631ee 100644
--- a/services/surfaceflinger/DisplayDevice.cpp
+++ b/services/surfaceflinger/DisplayDevice.cpp
@@ -233,7 +233,7 @@
         if (error == EGL_CONTEXT_LOST ||
                 mType == DisplayDevice::DISPLAY_PRIMARY) {
             LOG_ALWAYS_FATAL("eglSwapBuffers(%p, %p) failed with 0x%08x",
-                    mDisplay, mSurface, eglGetError());
+                    mDisplay, mSurface, error);
         }
     }
 }