clk: sunxi-ng: mp: Fix dual-divider clock rate readback

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: clk: sunxi-ng: mp: Fix dual-divider clock rate readback When dual-divider clock support was introduced, the P divider offset was left out of the .recalc_rate readback function. This causes the clock rate to become bogus or even zero (possibly due to the P divider being 1, leading to a divide-by-zero). Fix this by incorporating the P divider offset into the calculation.

References

• https://git.kernel.org/stable/c/40108f69c372af3aea73e7829d6849a44638d662
• https://git.kernel.org/stable/c/25fbbaf515acd13399589bd5ee6de5f35740cef2