fix smb streamwrapper on non existing files

apps/files_external/3rdparty/smb4php/smb.php

@@ -181,6 +181,8 @@ class smb {
 						return false;
 					}elseif(substr($regs[0],0,31)=='NT_STATUS_OBJECT_PATH_NOT_FOUND'){
 						return false;
+					}elseif(substr($regs[0],0,31)=='NT_STATUS_OBJECT_NAME_NOT_FOUND'){
+						return false;
 					}elseif(substr($regs[0],0,29)=='NT_STATUS_FILE_IS_A_DIRECTORY'){
 						return false;
 					}
@@ -430,7 +432,10 @@ class smb_stream_wrapper extends smb {
 			case 'rb':
 			case 'a':
 			case 'a+':  $this->tmpfile = tempnam('/tmp', 'smb.down.');
-				smb::execute ('get "'.$pu['path'].'" "'.$this->tmpfile.'"', $pu);
+				$result = smb::execute ('get "'.$pu['path'].'" "'.$this->tmpfile.'"', $pu);
+				if($result === false){
+					return $result;
+				}
 				break;
 			case 'w':
 			case 'w+':