[PATCH] Get format-patch to show first commit after root commit

["Nathan W. Panike" <nathan.panike@gmail.com>]

Currently, the command

git format-patch -1 e83c5163316f89bfbde

in the git repository creates an empty file.  Instead, one is
forced to do

git format-patch -1 --root e83c5163316f89bfbde

This seems arbitrary.  This patch fixes this case, so that

git format-patch -1 e83c5163316f89bfbde

will produce an actual patch.
---
 builtin-log.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/builtin-log.c b/builtin-log.c
index 4a02ee9..5e7b61f 100644
--- a/builtin-log.c
+++ b/builtin-log.c
@@ -977,6 +977,8 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 		list[nr - 1] = commit;
 	}
 	total = nr;
+	if (total == 1 && !list[0]->parents)
+		rev.show_root_diff=1;
 	if (!keep_subject && auto_number && total > 1)
 		numbered = 1;
 	if (numbered)
-- 
1.6.1.76.gc123b.dirty