ImageLoader: setError after null check

if request was canceled it will have already been removed
from mInFlightRequests and cause NPE

Change-Id: I1ce78bb6b3b2964545a47b5e3bb59bdf1a6d940e
Merge "ImageLoader: setError after null check"
Merge branch 'master' of https://android.googlesource.com/platform/frameworks/volley

# By Andrew Sutherland
# Via Andrew Sutherland (1) and Gerrit Code Review (1)
* 'master' of https://android.googlesource.com/platform/frameworks/volley:
  ImageLoader: setError after null check