Truncate range requests that go past the end of the file

If the range end was too high, the function would try (and fail) to return the full range asked for.

Fixes Issue happyworm#7.

smartReadFile.php

@@ -40,7 +40,7 @@ function smartReadFile($location, $filename, $mimeType = 'application/octet-stre
 			$begin	= intval($matches[1]);
 			if (!empty($matches[2]))
 			{
-				$end	= intval($matches[2]);
+				$end	= min($end, intval($matches[2]));
 			}
 		}
 	}