Fix error where multiple files at would be handled incorrectly.

When there are multiple files at the same level the path needs to be
reset on each iteration. Failing to do so causes adjacent files to be
nested incorrectly.

src/Network/Request.php

@@ -427,17 +427,18 @@ protected function _processFiles($post, $files) {
 	protected function _processFileData($data, $post, $path = '', $field = '') {
 		foreach ($post as $key => $fields) {
 			$newField = $field;
+			$newPath = $path;
 			if ($path === '' && $newField === '') {
 				$newField = $key;
 			}
 			if ($field === $newField) {
-				$path .= '.' . $key;
+				$newPath .= '.' . $key;
 			}
 			if (is_array($fields)) {
-				$data = $this->_processFileData($data, $fields, $path, $newField);
+				$data = $this->_processFileData($data, $fields, $newPath, $newField);
 			} else {
-				$path = trim($path . '.' . $field, '.');
-				$data = Hash::insert($data, $path, $fields);
+				$newPath = trim($newPath . '.' . $field, '.');
+				$data = Hash::insert($data, $newPath, $fields);
 			}
 		}
 		return $data;

tests/TestCase/Network/RequestTest.php

@@ -281,25 +281,31 @@ public function testProcessFilesNested() {
 			],
 			'pictures' => [
 				'name' => [
-					0 => ['file' => 'a-file.png']
+					0 => ['file' => 'a-file.png'],
+					1 => ['file' => 'a-moose.png']
 				],
 				'type' => [
-					0 => ['file' => 'image/png']
+					0 => ['file' => 'image/png'],
+					1 => ['file' => 'image/jpg']
 				],
 				'tmp_name' => [
-					0 => ['file' => '/tmp/file123']
+					0 => ['file' => '/tmp/file123'],
+					1 => ['file' => '/tmp/file234']
 				],
 				'error' => [
-					0 => ['file' => '0']
+					0 => ['file' => '0'],
+					1 => ['file' => '0']
 				],
 				'size' => [
-					0 => ['file' => 17188]
+					0 => ['file' => 17188],
+					1 => ['file' => 2010]
 				],
 			]
 		];
 		$post = [
 			'pictures' => [
-				0 => ['name' => 'A cat']
+				0 => ['name' => 'A cat'],
+				1 => ['name' => 'A moose']
 			],
 			0 => [
 				'name' => 'A dog'
@@ -326,6 +332,16 @@ public function testProcessFilesNested() {
 						'error' => '0',
 						'size' => 17188,
 					]
+				],
+				1 => [
+					'name' => 'A moose',
+					'file' => [
+						'name' => 'a-moose.png',
+						'type' => 'image/jpg',
+						'tmp_name' => '/tmp/file234',
+						'error' => '0',
+						'size' => 2010,
+					]
 				]
 			],
 			0 => [