cmd: Fix loop termination check in WCMD_batch.

[Robert Shearman]

The current check is wrong because sizeof(extension_batch) is equal to 2 
* WCMD_BATCH_EXT_SIZE * sizeof(WCHAR) and so already includes 
sizeof(WCHAR). Change the check to 
sizeof(extension_batch)/(WCMD_BATCH_EXT_SIZE*sizeof(WCHAR)) to get the 
required value of 2.
---
  programs/cmd/batch.c |    2 +-
  1 files changed, 1 insertions(+), 1 deletions(-)
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