i2c_packet: removed annotation duplicate

error fixed, thanks for bugreport on github by @jk-ozlabs (Jeremy Kerr)

Author: sespivak

decoders/i2c_packet/pd.py

@@ -64,7 +64,7 @@ class Decoder(srd.Decoder):
         ('data', 'Data'),
     )
     annotation_rows = (
-        ('data', 'Data', (Ann.DATA,)),
+        ('packet', 'Packet', (Ann.DATA,)),
     )
 
     def __init__(self):