Fix return values of do_passwd() in apps/passwd.c

do_passwd() was returning 0 on success and 1 on failure.  However,
those values were interpreted the other way around.  The fix that
makes the most sense is to change what do_passwd() returns.
Reviewed-by: NRich Salz <rsalz@openssl.org>

apps/passwd.c

@@ -496,10 +496,10 @@ static int do_passwd(int passed_salt, char **salt_p, char **salt_malloc_p,
         BIO_printf(out, "%s\t%s\n", hash, passwd);
     else
         BIO_printf(out, "%s\n", hash);
-    return 0;
+    return 1;
 
  end:
-    return 1;
+    return 0;
 }
 #else