Seek(0) before reading/writing attributes

Author: ddemidov

ev3dev.py

@@ -79,6 +79,7 @@ def read(self, path, size=-1):
         f = self.file_handle(path, 'r')
 
         try:
+            f.seek(0)
             value = f.read(size)
         except IOError:
             f = self.file_handle( path, 'w+', reopen=True )
@@ -93,6 +94,7 @@ def write(self, path, value):
         f = self.file_handle( path, 'w' )
 
         try:
+            f.seek(0)
             f.write( value )
             f.flush()
         except IOError: