git format-patch -k is broken, create non-empty file for hotfix.patch

OBS-URL: https://build.opensuse.org/package/show/Virtualization/libguestfs?expand=0&rev=284

0000-hotfix.patch

@@ -1,14 +1,18 @@
-From 46635c2ab4b5c93be5f30b01a464492c959be769 Mon Sep 17 00:00:00 2001
+From 0c5d0904ac4699ba02af1815598fa57ba296d3fd Mon Sep 17 00:00:00 2001
 From: Olaf Hering <olaf@aepfle.de>
 Date: Tue, 13 May 2014 15:31:21 +0200
 Subject: hotfix
 
 Signed-off-by: Olaf Hering <olaf@aepfle.de>
 ---
- pkg-hotfix.txt | 0
- 1 file changed, 0 insertions(+), 0 deletions(-)
+ pkg-hotfix.txt | 1 +
+ 1 file changed, 1 insertion(+)
  create mode 100644 pkg-hotfix.txt
 
 diff --git a/pkg-hotfix.txt b/pkg-hotfix.txt
 new file mode 100644
-index 0000000..e69de29
+index 0000000..8b13789
+--- /dev/null
++++ b/pkg-hotfix.txt
+@@ -0,0 +1 @@
++