Make sure dump-mode is nil after dump

* lisp/loadup.el (dump-mode): Bind dump-mode to nil before dumping
1 job for master in 48 minutes and 20 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #558
test-all

00:48:20

 
Name Stage Failure
failed
test-all Test
Makefile:309: recipe for target 'check-doit' failed
make[2]: *** [check-doit] Error 1
make[2]: Leaving directory '/builds/emacs/emacs/test'
Makefile:284: recipe for target 'check-expensive' failed
make[1]: *** [check-expensive] Error 2
make[1]: Leaving directory '/builds/emacs/emacs/test'
Makefile:960: recipe for target 'check-expensive' failed
make: *** [check-expensive] Error 2
ERROR: Job failed: exit code 1