ipc_nv_data_md5_calculate: handle size mismatch betterreplicant-6.0-0004-rc4

Currently libsamsung-ipc assumes that the size of nv_data.bin
files are always 0x200000.

While it's supposed to be the case for all the devices we support,
it is still a good idea to make sure that a meaningful error message
is reported to the users of nv_data-md5.

For instance if we created an empty file of 1 kB with the following
command:
    $ ddrescue -s 1k /dev/zero zero.img

and that we used nv_data-md5 on it:
    $ ./tools/nv_data-md5 zero.img
    [ipc] file_data_read: Error: rc < 0
    [ipc] ipc_nv_data_md5_calculate failed: data is NULL
    Calculating nv_data backup md5 failed
we had a completely meaningless error message.

With this patch the error message looks like that instead:
    $ ./tools/nv_data-md5 zero.img
    [ipc] ipc_nv_data_md5_calculate: Checking zero.img size failed:
          requested size: 2097152, file size: 1000
    Calculating nv_data backup md5 failed
Here users have at least a fighting chance of being able to understand
what is going wrong.

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

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