[PATCH] xfsprogs: check for size parsing errors in xfs_quota

[Christoph Hellwig]

On Mon, Jan 23, 2012 at 11:31:53AM -0600, Eric Sandeen wrote:
> Doing something like 
> 
> # xfs_quota -x -c 'limit -u bhard=1.2g ...
> 
> will cause cvtnum to fail and return a value of -1LL (because it
> cannot parse the decimal), but the quota caller doesn't check
> for this error value, casts it to U64, shifts right, and we end
> up with an answer of 16 petabytes rather than erroring out.
> Fix this.

Can you add a test case for it, please?