[PATCH] vfs_fruit: Fix potential devide by zero to resolve Time Machine backup max size issue

[Kenneth Van Alstyne]

Hello all:
	I recently ran into an issue with Samba 4.10.5 that caused smbd to crash when the "fruit:time machine max size” option was set, but before an initial backup was done in the share, resulting in a divide by zero error.  This has been discussed in detail in the "https://bugzilla.samba.org/show_bug.cgi?id=13622” bugzilla and impacted me on x86_64, so not only armv7l.  The attached patch resolved the issue for me, so can this be reviewed and if deemed appropriate pushed to master and backported to the 4.10 branch?

Thanks,

--
Kenneth Van Alstyne
Systems Architect
Knight Point Systems, LLC
Service-Disabled Veteran-Owned Business
1775 Wiehle Avenue Suite 101 | Reston, VA 20190
c: 228-547-8045 f: 571-266-3106
www.knightpoint.com 
DHS EAGLE II Prime Contractor: FC1 SDVOSB Track
GSA Schedule 70 SDVOSB: GS-35F-0646S
GSA MOBIS Schedule: GS-10F-0404Y
ISO 9001 / ISO 20000 / ISO 27001 / CMMI Level 3

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