Detect and handle invalid number of FATs

If the number of FATs field in the boot sector is zero, give
an appropriate error code.

Change-Id: I56545fb322a9d4c94aea8ddbd4879701617100e4
Signed-off-by: Sebastian Rasmussen <sebastian.rasmussen@stericsson.com>
Signed-off-by: Christian Bejram <christian.bejram@stericsson.com>
1 file changed