fix(_command_offset): discard previous results on retries

Author: akinomyoga

bash_completion

@@ -2096,6 +2096,10 @@ _command_offset()
 
                 # restart completion (once) if function exited with 124
                 if (($? == 124 && retry_count++ == 0)); then
+                    # Note: When the completion function returns 124, the state
+                    # of COMPREPLY is discarded.
+                    COMPREPLY=()
+
                     cspec=$(complete -p "$compcmd" 2>/dev/null)
 
                     # Note: When completion spec is removed after 124, we do