patch 9.0.1012: tests may get stuck in buffer with swap file

Problem:    Tests may get stuck in buffer with swap file.
Solution:   Bail out when bwipe! doesn't get another buffer.
diff --git a/src/version.c b/src/version.c
index 48bec3d..99f8b66 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1012,
+/**/
     1011,
 /**/
     1010,