Fix nproc being initialised to 1

Previously nproc was initialised to 0. This meant that get_mon_out() wouldn't work as expected when not using MPI due to a bad assumption in an if statement.

Author: Andrew-Beggs-ECMWF

src/fiat/drhook/internal/dr_hook_procinfo.F90

@@ -17,7 +17,7 @@ SUBROUTINE DR_HOOK_PROCINFO(KMYPROC, KNPROC)
 INTEGER(KIND=JPIM) :: IERROR
 
 KMYPROC=-1
-KNPROC=0
+KNPROC=1
 CALL MPI_INITIALIZED(LMPI_INITIALIZED,IERROR)
 IF( LMPI_INITIALIZED ) THEN
   CALL MPI_COMM_SIZE(MPI_COMM_WORLD,KNPROC,IERROR)