CLEANUP: Remove comment that's no longer valid

Code was deleted in ad63582eb, but the comment remained.

Signed-off-by: Nenad Merdanovic <nmerdan@haproxy.com>
diff --git a/src/sample.c b/src/sample.c
index 014913d..71d4e32 100644
--- a/src/sample.c
+++ b/src/sample.c
@@ -649,10 +649,6 @@
 {
 	struct chunk *trash;
 
-	/* If the const flag is not set, we don't need to duplicate the
-	 * pattern as it can be modified in place.
-	 */
-
 	switch (smp->data.type) {
 	case SMP_T_BOOL:
 	case SMP_T_SINT: