patch 9.1.0022: Coverity complains about improper use of negative value

Problem:  Coverity complains about improper use of negative value
Solution: Add a condition to validate that keytyped is larger or equal
          to 0

Apparently patch 9.1.0006 made it more explicit for Coverity, that the
TOLOWER_LOC() macros do not handle negative values properly. However,
that condition has always been there even before that, so add a
condition to verify that keytyped is indeed at least 0

closes: #13824

Signed-off-by: Christian Brabandt <cb@256bit.org>

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    22,
 /**/
     21,
 /**/