patch 9.1.1072: 'diffopt' "linematch" cannot be used with {n} less than 10

Problem:  'diffopt' "linematch" cannot be used with {n} less than 10
          digits (after v9.1.1022)
Solution: Fix off-by-one error when checking for digit (zeertzjq)

closes: #16577

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 b953f90..dd500d1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1072,
+/**/
     1071,
 /**/
     1070,