net: pse-pd: Fix out of bound for loop

In the Linux kernel, the following vulnerability has been resolved:

net: pse-pd: Fix out of bound for loop

Adjust the loop limit to prevent out-of-bounds access when iterating over

PI structures. The loop should not reach the index pcdev->nr_lines since

we allocate exactly pcdev->nr_lines number of PI structures. This fix

ensures proper bounds are maintained during iterations.