Fix device_block_size_fd to return bsize correctly incase of files.
Fix device_block_size_fd to return bsize correctly incase of files.

This patch is for issue #287

In the code for returning block size ( device_block_size_fd in lib/utils_device.c ),
always returns zero in case of files and device_read_test is not executed.

This patch is to fix device_block_size_fd to return block size correctly incase of files.

Signed-off-by: c617bd4e7a42d9bba7076963b37b8373d31e7a7d@linux.vnet.ibm.com

periodic1236/cryptsetup,periodic1236/cryptsetup,periodic1236/cryptsetup