qemu-system-sparc crashes on floppy access
Description of problem:
qemu-system-sparc crashes when accessing the emulated floppy drive of the guest system.
Steps to reproduce:
1. wget http://ftp.netbsd.org/pub/NetBSD/NetBSD-9.2/sparc/installation/bootfs/boot.fs.gz
2. gunzip boot.fs.gz
3. qemu-system-sparc -nographic boot.fs
4. Select option "3) floppy"
5. qemu-systems-sparc crashes with the messages:
```
    Ejecting floppy disk
    Segmentation fault (core dumped)
```