common/cmd_load.c - Minor code & Coding Style cleanup

- os_data_header Variable is a carry over feature
   & unused. So removed all instance of this variable
 - Minor Code Style Update

Signed-off-by: Gururaja Hebbar <gururajakr@sanyo.co.in>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>