emacs-init-time outputs more digits now

* lisp/time.el (emacs-init-time): Output more digits;
formerly this was always outputting "0.0 seconds" for me
because the number of seconds was less than 0.1.
1 job for master in 49 minutes and 39 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #841
test-all

00:49:39

 
Name Stage Failure
failed
test-all Test
make[2]: *** [check-doit] Error 1
Makefile:309: recipe for target 'check-doit' failed
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:962: recipe for target 'check-expensive' failed
make: *** [check-expensive] Error 2
ERROR: Job failed: exit code 1