common/cmd_nvedit.c: Fix GCC 4.6 warning

cmd_nvedit.c: In function '_do_env_set':
cmd_nvedit.c:207:9: warning: unused variable 'bd' [-Wunused-variable]

Signed-off-by: Anatolij Gustschin <agust@denx.de>

common/cmd_nvedit.c

@@ -204,7 +204,6 @@ static int do_env_grep(cmd_tbl_t *cmdtp, int flag,
  */
 int _do_env_set(int flag, int argc, char * const argv[])
 {
-	bd_t  *bd = gd->bd;
 	int   i, len;
 	int   console = -1;
 	char  *name, *value, *s;