patch 8.1.0989: various small code ugliness

Problem:    Various small code ugliness.
Solution:   Remove pointless NULL checks. Fix function calls. Fix typos.
            (Dominique Pelle, closes #4060)
diff --git a/src/version.c b/src/version.c
index e435ded..1396574 100644
--- a/src/version.c
+++ b/src/version.c
@@ -41,7 +41,7 @@
 {
     /*
      * Construct the long version string.  Necessary because
-     * VAX C can't catenate strings in the preprocessor.
+     * VAX C can't concatenate strings in the preprocessor.
      */
     strcpy(longVersion, VIM_VERSION_LONG_DATE);
     strcat(longVersion, __DATE__);
@@ -780,6 +780,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    989,
+/**/
     988,
 /**/
     987,