lreplace: avoid memmove() with NULL pointer

In the case there is nothing to insert

Could be provoked with: lreplace {a b} 0 0

Fixes: #300
Signed-off-by: Steve Bennett <steveb@workware.net.au>

1 files changed, 5 insertions, 0 deletions

diff --git a/jim.c b/jim.c
index 8588b7f..f364c00 100644
--- a/jim.c
+++ b/jim.c
@@ -7114,6 +7114,11 @@ static void ListInsertElements(Jim_Obj *listPtr, int idx, int elemc, Jim_Obj *co
     int i;
     Jim_Obj **point;
 
+    if (elemc == 0) {
+        /* Nothing to do */
+        return;
+    }
+
     if (requiredLen > listPtr->internalRep.listValue.maxLen) {
         if (currentLen) {
             /* Assume that we will need extra space for future expansion */