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>
diff --git a/src/version.c b/src/version.c
index 396a163..986b174 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2185,
+/**/
     2184,
 /**/
     2183,
diff --git a/src/vim9instr.c b/src/vim9instr.c
index 5059eb0..a2179f3 100644
--- a/src/vim9instr.c
+++ b/src/vim9instr.c
@@ -418,9 +418,9 @@
 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;
 }