More usage of dbm::is_result($r) instead of count($r):

- count() returns very different results and never a boolean (not even false on
  error condition).
- therefore you should NOT use it in boolean expressions. This still *can* be
  done in PHP because of its lazyness. But it is discouraged if it comes to
  more clean code.

Signed-off-by: Roland Häder <roland@mxchange.org>

mod/api.php

@@ -14,7 +14,7 @@ function oauth_get_client($request){
 			AND `tokens`.`id`='%s' AND `tokens`.`scope`='request'",
 			dbesc($token));
 
-	if (!count($r))
+	if (!dbm::is_result($r))
 		return null;
 
 	return $r[0];