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

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

Rework this patch to try to handle the case where one does

git format-patch -n ...

and n is a number larger than 1.  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.

Signed-off-by: Nathan W. Panike <nathan.panike@gmail.com>
---
 builtin-log.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/builtin-log.c b/builtin-log.c
index 4a02ee9..0eca15f 100644
--- a/builtin-log.c
+++ b/builtin-log.c
@@ -975,6 +975,9 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 		nr++;
 		list = xrealloc(list, nr * sizeof(list[0]));
 		list[nr - 1] = commit;
+		if(!commit->parents){
+			rev.show_root_diff=1;
+		}
 	}
 	total = nr;
 	if (!keep_subject && auto_number && total > 1)
-- 
1.6.1.76.gc123b.dirty