util: Fix typo in cpt upgrader

The module is errno, not ennro.

Change-Id: I3f17bdc12a7acd680ac407042a75d5099f5f7339
Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/46799
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>
(cherry picked from commit 6977456207)
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/47099
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>

util/cpt_upgrader.py

@@ -185,7 +185,7 @@ class Upgrader:
 def process_file(path, **kwargs):
     if not osp.isfile(path):
         import errno
-        raise IOError(ennro.ENOENT, "No such file", path)
+        raise IOError(errno.ENOENT, "No such file", path)
 
     verboseprint("Processing file %s...." % path)