git-p4: fix keyword-expansion regex

git-p4: fix keyword-expansion regex

This text:

     my $dir = $File::Find::dir;
     return if ($dir !~ m,$options->{dirpat}$,);

was improperly converted to:

     my $dir = $File$dir !~ m,$options->{dirpat}$,);

by the keyword identifier expansion code.  Add a \n
to make sure the regex doesn't go across end-of-line
boundaries.

Signed-off-by: Pete Wyckoff <redacted>
Acked-by: Simon Hausmann <redacted>
Signed-off-by: Junio C Hamano <redacted>