[PATCH] qemu_conf: Fix double free problem for cfg->firmwares

[Tuguoyi]

On a Tuesday in 2020, Ján Tomko wrote:
> On a Tuesday in 2020, Tuguoyi wrote:
> >cfg->firmwares still points to the original memory address after being
> >freed by virFirmwareFreeList(). As cfg get freed, it will be freed again
> >even if cfg->nfirmwares=0 which eventually lead to crash.
> >
> >The patch fix it by setting cfg->firmwares to NULL explicitly after
> >virFirmwareFreeList() returns
> >
> >Signed-off-by: Tuguoyi <tu.guoyi at h3c.com>
> 
> Should there be a space separating your name(s)?
It can be changed to:
Signed-off-by: Guoyi Tu<tu.guoyi at h3c.com>