[djwong-xfs:scrub-rtsummary 43/43] fs/xfs/scrub/rtsummary.c:199:45: sparse: sparse: Using plain integer as NULL pointer

[kbuild test robot <lkp@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git scrub-rtsummary
head:   2e7ef2860bfce11463cddefdb4fddc674825d445
commit: 2e7ef2860bfce11463cddefdb4fddc674825d445 [43/43] xfs: implement online scrubbing of rtsummary info
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.1-187-gbff9b106-dirty
        git checkout 2e7ef2860bfce11463cddefdb4fddc674825d445
        make ARCH=x86_64 allmodconfig
        make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>


sparse warnings: (new ones prefixed by >>)

>> fs/xfs/scrub/rtsummary.c:199:45: sparse: sparse: Using plain integer as NULL pointer

vim +199 fs/xfs/scrub/rtsummary.c

   189	
   190	/*
   191	 * Compute the realtime summary from the realtime bitmap.  This is a kernel
   192	 * port of the defunct process_rtbitmap function in xfs_repair.
   193	 */
   194	STATIC int
   195	xchk_rtsum_compute(
   196		struct xfs_scrub	*sc,
   197		struct file		*sumfile)
   198	{
 > 199		struct xchk_rtsum_compute state = { 0 } ;
   200		struct xfs_mount	*mp = sc->mp;
   201		unsigned long long	rtbmp_bytes;
   202		xfs_fileoff_t		off = 0;
   203		xfs_fileoff_t		end_off;
   204		int			error;
   205	
   206		state.sumfile = sumfile;
   207		rtbmp_bytes = howmany(mp->m_sb.sb_rextents, NBBY);
   208		end_off = howmany(rtbmp_bytes, mp->m_sb.sb_blocksize);
   209	
   210		/* If the bitmap size doesn't match the computed size, bail. */
   211		if (roundup(rtbmp_bytes, mp->m_sb.sb_blocksize) !=
   212				mp->m_rbmip->i_d.di_size)
   213			return -EFSCORRUPTED;
   214	
   215		for (off = 0; off < end_off; off++) {
   216			error = xchk_rtsum_process_bmblock(sc, off, &state);
   217			if (error)
   218				return error;
   219			if (state.rt_extent_nr == mp->m_sb.sb_rextents)
   220				break;
   221		}
   222		if (state.in_extent) {
   223			error = xchk_rtsum_record_free(sc, &state);
   224			if (error)
   225				return error;
   226		}
   227	
   228		return 0;
   229	}
   230	

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