random: Remove redundant assignments in php_random_rangeX()

[jorgsowa]

Found 2 redundant assignments in random.c + missing commas in comments.

[jorgsowa]

@TimWolla thanks for the suggestions. Although, I don't get the point:

By keeping the declaration separate the loop at the top can simply be copy-and-pasted without needing to remove the type declaration.

Why do you need to copy and paste this part?

[TimWolla]

Why do you need to copy and paste this part?

While I expect the implementation of these loops to remain stable for the foreseeable future, in case of necessary changes (such as ab5491f), the changes would need to be applied to both loops identically. It's easier to simply copy-and-paste them, instead of manually performing the identical change in both locations.