Fix infinite loop when minYear/maxYear are not int.

Refs #2361

Author: markstory

lib/Cake/Test/Case/View/Helper/FormHelperTest.php

@@ -5624,6 +5624,9 @@ public function testYear() {
 			'/select',
 		);
 		$this->assertTags($result, $expected);
+
+		$result = $this->Form->year('published', array(), array(), array('empty' => false));
+		$this->assertContains('data[Contact][published][year]', $result);
 	}
 
 /**

lib/Cake/View/Helper/FormHelper.php

@@ -2461,17 +2461,9 @@ protected function _generateOptions($name, $options = array()) {
 			case 'year':
 				$current = intval(date('Y'));
 
-				if (!isset($options['min'])) {
-					$min = $current - 20;
-				} else {
-					$min = $options['min'];
-				}
+				$min = !isset($options['min']) ? $current - 20 : (int)$options['min'];
+				$max = !isset($options['max']) ? $current + 20 : (int)$options['max'];
 
-				if (!isset($options['max'])) {
-					$max = $current + 20;
-				} else {
-					$max = $options['max'];
-				}
 				if ($min > $max) {
 					list($min, $max) = array($max, $min);
 				}