nshlib/nsh_parse: Fix "e" flag not take effect

The NSH exits when a command exits with a non-zero status, even if the "e" flag is not set.
This error does not exist in NSH scripts.

Without this patch:

  nsh> sh -c "set -e; mkdir /test; echo $?"
  nsh: /test: mkdir failed: 17
  nsh> sh -c "set +e; mkdir /test; echo $?"
  nsh: /test: mkdir failed: 17
  nsh> rm /test
  nsh> sh -c "set +e; mkdir /test; echo $?"
  0

With this patch:

  nsh> sh -c "set -e; mkdir /test; echo $?"
  nsh: /test: mkdir failed: 17
  nsh> sh -c "set +e; mkdir /test; echo $?"
  nsh: /test: mkdir failed: 17
  1
  nsh> rm /test
  nsh> sh -c "set +e; mkdir /test; echo $?"
  0

Signed-off-by: wangjianyu3 <[email protected]>

Author: JianyuWang0623

nshlib/nsh_parse.c

@@ -2936,7 +2936,11 @@ int nsh_parse(FAR struct nsh_vtbl_s *vtbl, FAR char *cmdline)
           /* Parse this command */
 
           ret = nsh_parse_command(vtbl, start);
-          if (ret != OK)
+          if (ret != OK
+#ifndef CONFIG_NSH_DISABLESCRIPT
+              && !(vtbl->np.np_flags & NSH_PFLAG_IGNORE)
+#endif
+             )
             {
               /* nsh_parse_command may return (1) -1 (ERROR) meaning that the
                * command failed or we failed to start the command application