[SCSI] iscsi: only preallocate login buffer
We only use the mtask data buffer for login tasks so we do not need to preallocate a buffer for every mtask. This saves 8 * 31 KB. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
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