If a git commit description is split on consecutive lines, coalesce it
before testing.

This allows:

  commit <foo> ("some long
  description")
Signed-off-by: NJoe Perches <joe@perches.com>
Reported-by: NPaul Bolle <pebolle@tiscali.nl>
Tested-by: NPaul Bolle <pebolle@tiscali.nl>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>