patch 9.0.2185: Coverity complains about not checking return value

Problem:  Coverity complains about not checking return value
          in compare_isn_not_values (after 9.0.2184)
Solution: cast return value to "(void)" to make intention clear

closes: #13751

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

Author: chrisbra

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2185,
 /**/
     2184,
 /**/

src/vim9instr.c

@@ -418,9 +418,9 @@ generate_two_op(cctx_T *cctx, char_u *op)
 compare_isn_not_values(typval_T *tv, type_T *type)
 {
     if (tv != NULL)
-	check_typval_is_value(tv);
+	(void)check_typval_is_value(tv);
     else
-	check_type_is_value(type);
+	(void)check_type_is_value(type);
     return ISN_DROP;
 }