hush: Fix bogus free() call

An off-by-one error in hush.c resulted in an unintentional free() call
every time a command was executed

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>

common/hush.c

@@ -2002,7 +2002,7 @@ static int free_pipe(struct pipe *pi, int indent)
 #ifndef __U_BOOT__
 			globfree(&child->glob_result);
 #else
-			for (a = child->argc;a >= 0;a--) {
+			for (a = 0; a < child->argc; a++) {
 				free(child->argv[a]);
 			}
 					free(child->argv);