[S390] hypfs crashes with invalid mount option.
When an invalid mount option is specified, no root inode is created for hypfs, hypfs_fill_super() returns with -EINVAL and then hypfs_kill_super() is called. hypfs_kill_super() does not check if the root inode has been initialized. This patch adds this check. Signed-off-by: NMichael Holzheu <holzheu@de.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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