patch 9.1.1273: Coverity warns about using uninitialized value

Problem:  Coverity warns about using uninitialized value
          (after 9.1.1270).
Solution: Put an empty string in "buf" when allocation fails (zeertzjq).

closes: #17040

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 28c0248..e00e007 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1273,
+/**/
     1272,
 /**/
     1271,