Illegal/incorrect type for loop variable in process library

[tclune]

Reported by NOAA colleagues:

https://github.com/GEOS-ESM/GOCART/blob/main/Process_Library/GOCART2G_Process.F90#L5721
where loop index "k" should be integer but is real.

[weiyuan-jiang]

It was fixed in the develop branch 7 months ago

GOCART/Process_Library/GOCART2G_Process.F90

Line 5779 in 7cf6f60

integer :: i, j, k, it