[U-Boot] [PATCH v2] command.c: Enable auto tab for the editenv command

[Trübenbach Ralf]

Enable the auto completion (with TAB) of the environment variable name 
after the editenv command.

Signed-off-by: Ralf Trübenbach <ralf.truebenbach at men.de>
---
Changes from v1:
Resend patch because of invalid patch format.

diff --git a/common/command.c b/common/command.c
index 0c66b7a..67ad692 100644
--- a/common/command.c
+++ b/common/command.c
@@ -188,6 +188,9 @@

 void install_auto_complete(void)
 {
+#if defined(CONFIG_CMD_EDITENV)
+       install_auto_complete_handler("editenv", var_complete);
+#endif
        install_auto_complete_handler("printenv", var_complete);
        install_auto_complete_handler("setenv", var_complete);
 #if defined(CONFIG_CMD_RUN)