Fix git-p4 decode_path() missing an assignment

git-p4.py

@@ -258,8 +258,7 @@ def metadata_stream_to_writable_bytes(s):
     if encodingStrategy == 'passthrough':
         return s
     try:
-        s.decode('utf_8')
-        return s
+        return s.decode('utf_8')
     except UnicodeDecodeError:
         if encodingStrategy == 'fallback' and fallbackEncoding:
             global encoding_fallback_warning_issued
@@ -304,10 +303,10 @@ def decode_path(path):
 
     encoding = gitConfig('git-p4.pathEncoding') or 'utf_8'
     if bytes is not str:
-        return path.decode(encoding, errors='replace') if isinstance(path, bytes) else path
+        path = path.decode(encoding, errors='replace') if isinstance(path, bytes) else path
     else:
         try:
-            path.decode('ascii')
+            path = path.decode('ascii')
         except:
             path = path.decode(encoding, errors='replace')
             if verbose:
@@ -3114,7 +3113,7 @@ def writeToGitStream(self, gitMode, relPath, contents):
 
     def encodeWithUTF8(self, path):
         try:
-            path.decode('ascii')
+            path = path.decode('ascii')
         except:
             encoding = 'utf8'
             if gitConfig('git-p4.pathEncoding'):