Apply code style fixes

src/Jira/Api.php

@@ -110,7 +110,7 @@
 		$this->setEndPoint($endpoint);
 		$this->authentication = $authentication;
 
-		if ( is_null($client) ) {
+		if ( $client === null ) {
 			$client = new CurlClient();
 		}
 
@@ -689,7 +689,7 @@
 						'object' => $object,
 					);
 
-		if ( !is_null($application) ) {
+		if ( $application !== null ) {
 			$options['application'] = $application;
 		}
 
@@ -744,13 +744,11 @@
 			if ( $return_as_array ) {
 				return $json;
 			}
-			else {
-				return new Result($json);
-			}
-		}
-		else {
-			return false;
+
+			return new Result($json);
 		}
+
+		return false;
 	}
 
 	/**

src/Jira/Api/Client/CurlClient.php

@@ -25,9 +25,9 @@
 namespace chobie\Jira\Api\Client;
 
 
+use chobie\Jira\Api\Authentication\Anonymous;
 use chobie\Jira\Api\Authentication\AuthenticationInterface;
 use chobie\Jira\Api\Authentication\Basic;
-use chobie\Jira\Api\Authentication\Anonymous;
 use chobie\Jira\Api\Exception;
 use chobie\Jira\Api\UnauthorizedException;
 
@@ -146,7 +146,7 @@ public function sendRequest(
 		}
 
 		// @codeCoverageIgnoreStart
-		if ( is_null($response) ) {
+		if ( $response === null ) {
 			throw new Exception('JIRA Rest server returns unexpected result.');
 		}
 		// @codeCoverageIgnoreEnd

src/Jira/Api/Client/PHPClient.php

@@ -181,7 +181,7 @@ public function sendRequest(
 		}
 
 		// @codeCoverageIgnoreStart
-		if ( is_null($response) ) {
+		if ( $response === null ) {
 			throw new Exception('JIRA Rest server returns unexpected result.');
 		}
 		// @codeCoverageIgnoreEnd

src/Jira/Issues/Walker.php

@@ -157,9 +157,8 @@ public function current()
 
 			return $callback($tmp);
 		}
-		else {
-			return $this->issues[$this->offset];
-		}
+
+		return $this->issues[$this->offset];
 	}
 
 	/**
@@ -184,9 +183,8 @@ public function key()
 		if ( $this->startAt > 0 ) {
 			return $this->offset + (($this->startAt - 1) * $this->perPage);
 		}
-		else {
-			return 0;
-		}
+
+		return 0;
 	}
 
 	/**
@@ -200,7 +198,7 @@ public function key()
 	 */
 	public function valid()
 	{
-		if ( is_null($this->jql) ) {
+		if ( $this->jql === null ) {
 			throw new \Exception('you have to call Jira_Walker::push($jql, $fields) at first');
 		}
 
@@ -247,9 +245,8 @@ public function valid()
 				if ( ($this->startAt - 1) * $this->perPage + $this->offset < $this->total ) {
 					return true;
 				}
-				else {
-					return false;
-				}
+
+				return false;
 			}
 		}
 	}