Fix a double-free

On an error here, we'd free `info->sit_blocks` just above this line,
return to `generate_f2fs_info`, jump to the `error` label, and call
`free_f2fs_info`. `free_f2fs_info` helpfully frees `info->sit_blocks`.

Caught by the static analyzer.

Bug: None
Test: Static analyzer no longer complains.
Change-Id: I52a158b35f19736b0bfd9cccf969f8fca9237928
1 file changed