Fix gpuarray cuDNN version check. (Fixes #5369.)

theano/gpuarray/dnn.py

@@ -135,7 +135,7 @@ def _dnn_check_version():
     if v < 5000:
         return False, "cuDNN version is too old. Update to v5, was %d." % v
     # 5200 should not print warning with cudnn 5.1 final.
-    if version >= 5200:
+    if v >= 5200:
         warnings.warn("Your cuDNN version is more recent than "
                       "Theano. If you encounter problems, try "
                       "updating Theano or downgrading cuDNN to "