patch 9.1.1098: leaking memory with completing multi lines

Problem:  leaking memory with completing multi lines
          (after v9.1.1086)
Solution: free allocated memory (glepnir)

closes: #16605

Signed-off-by: glepnir <glephunter@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

Author: glepnir

src/insexpand.c

@@ -4416,7 +4416,11 @@ ins_compl_delete(void)
     if ((int)curwin->w_cursor.col > col)
     {
 	if (stop_arrow() == FAIL)
+	{
+	    if (remaining)
+		VIM_CLEAR(remaining);
 	    return;
+	}
 	backspace_until_column(col);
 	compl_ins_end_col = curwin->w_cursor.col;
     }

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1098,
 /**/
     1097,
 /**/