patch 9.1.1331: Leaking memory with cmdcomplete()

Problem:  Leaking memory with cmdcomplete()
          (zeertzjq, after v9.1.1329)
Solution: free the memory (Girish Palya)

closes: #17190

Signed-off-by: Girish Palya <girishji@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/cmdexpand.c b/src/cmdexpand.c
index 45f69bb..5b87d78 100644
--- a/src/cmdexpand.c
+++ b/src/cmdexpand.c
@@ -1244,7 +1244,10 @@
 
     // Save cmdline before expansion
     if (ccline->cmdbuff != NULL)
+    {
+	vim_free(cmdline_orig);
 	cmdline_orig = vim_strnsave(ccline->cmdbuff, ccline->cmdlen);
+    }
 
     if (xp->xp_numfiles == -1)
     {