smooth-dl: fix a FutureWarning from python 2.7

./smooth-dl.py:137: FutureWarning: This search is broken in 1.3 and earlier, and will be fixed in a future version.  If you rely on the current behaviour, change it to './/StreamIndex'

diff --git a/smooth-dl.py b/smooth-dl.py
index 36ba345..2baa009 100755 (executable)
--- a/smooth-dl.py
+++ b/smooth-dl.py
@@ -134,7 +134,7 @@ def get_manifest(base_url, dest_dir=tempfile.gettempdir(),
 
 def print_manifest_info(manifest):
 
-    streams = manifest.findall('//StreamIndex')
+    streams = manifest.findall('.//StreamIndex')
 
     for i, s in enumerate(streams):
         stream_type = s.attrib["Type"]
@@ -166,7 +166,7 @@ def download_chunks(base_url, manifest, stream_index, quality_level, dest_dir):
     if os.path.exists(dest_dir) == False:
         os.mkdir(dest_dir, 0755)
 
-    stream = manifest.findall('//StreamIndex')[stream_index]
+    stream = manifest.findall('.//StreamIndex')[stream_index]
 
     quality = stream.findall("QualityLevel")[quality_level]
     bitrate = quality.attrib["Bitrate"]
@@ -216,7 +216,7 @@ def rebuild_stream(manifest, stream_index, quality_level, src_dir,
     if final_dest_file == None:
         final_dest_file = dest_file_name
 
-    stream = manifest.findall('//StreamIndex')[stream_index]
+    stream = manifest.findall('.//StreamIndex')[stream_index]
 
     quality = stream.findall("QualityLevel")[quality_level]
     bitrate = quality.attrib["Bitrate"]
@@ -275,7 +275,7 @@ def rebuild_stream(manifest, stream_index, quality_level, src_dir,
 
 
 def calc_tracks_delay(manifest, stream1_index, stream2_index):
-    streams = manifest.findall('//StreamIndex')
+    streams = manifest.findall('.//StreamIndex')
 
     s1 = streams[stream1_index]
     s2 = streams[stream2_index]