remove "prev" argument for inst files; move open file logging to before pio call

Author: peverwhee

src/control/cam_history.F90

@@ -5738,7 +5738,7 @@ subroutine wshist (rgnht_in)
                inst_filename_spec = hfilename_spec(t)
             end if
             fname_inst = interpret_filename_spec( inst_filename_spec, number=(t-1), &
-                 prev=prev, flag_spec='i' )
+                 flag_spec='i' )
           end if
           !
           ! Check that this new filename isn't the same as a previous or current filename

src/utils/cam_pio_utils.F90

@@ -1133,12 +1133,14 @@ subroutine cam_pio_openfile(file, fname, mode)
 
     integer :: ierr
 
+    if(pio_iotask_rank(pio_subsystem) == 0) then
+       write(iulog,*) 'Opening existing file ', trim(fname), file%fh
+    end if
+
     ierr = pio_openfile(pio_subsystem, file, pio_iotype, fname, mode)
 
     if(ierr/= PIO_NOERR) then
        call endrun('Failed to open '//trim(fname)//' to read')
-    else if(pio_iotask_rank(pio_subsystem) == 0) then
-       write(iulog,*) 'Opened existing file ', trim(fname), file%fh
     end if
 
   end subroutine cam_pio_openfile