ssb: Fix division by zero issue in ssb_calc_clock_rate

In ssb_calc_clock_rate(), there is a potential issue where the value of
m1 could be zero due to initialization using clkfactor_f6_resolv(). This
situation raised concerns about the possibility of a division by zero
error.

We fixed it by following the suggestions provided by Larry Finger
<[email protected]> and Michael Büsch <[email protected]>. The fix
involves returning a value of 1 instead of 0 in clkfactor_f6_resolv().
This modification ensures the proper functioning of the code and
eliminates the risk of division by zero errors.

Signed-off-by: Rand Deeb <[email protected]>
Acked-by: Larry Finger <[email protected]>
Acked-by: Michael Büsch <[email protected]>
Signed-off-by: Kalle Valo <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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