(*)Corrected OBC allocated tests in advect_y

  Corrected two allocated tests for OBC-related arrays in advect_y, bringing
them into conformity with what was already being done in advect_x.  Given the
nature of these changes, it seems likely that any case that would have worked
before will give bitwise identical answers, but that segmentation faults might
now be avoided in certain configurations using OBCs.

src/tracer/MOM_tracer_advect.F90

@@ -967,7 +967,7 @@ subroutine advect_y(Tr, hprev, vhr, vh_neglect, OBC, domore_v, ntr, Idt, &
                     (vhr(i,J,k) < 0.0) .and. (segment%direction == OBC_DIRECTION_N)) then
                   vhh(i,J) = vhr(i,J,k)
                   do m=1,ntr
-                    if (allocated(segment%tr_Reg%Tr(m)%t)) then
+                    if (allocated(segment%tr_Reg%Tr(m)%tres)) then
                       flux_y(i,m,J) = vhh(i,J)*OBC%segment(n)%tr_Reg%Tr(m)%tres(i,J,k)
                     else ; flux_y(i,m,J) = vhh(i,J)*OBC%segment(n)%tr_Reg%Tr(m)%OBC_inflow_conc ; endif
                   enddo
@@ -990,7 +990,7 @@ subroutine advect_y(Tr, hprev, vhr, vh_neglect, OBC, domore_v, ntr, Idt, &
                   (vhr(i,J,k) < 0.0) .and. (G%mask2dT(i,j+1) < 0.5)) then
                 vhh(i,J) = vhr(i,J,k)
                 do m=1,ntr
-                  if (allocated(segment%tr_Reg%Tr(m)%t)) then
+                  if (allocated(segment%tr_Reg%Tr(m)%tres)) then
                     flux_y(i,m,J) = vhh(i,J)*segment%tr_Reg%Tr(m)%tres(i,J,k)
                   else ; flux_y(i,m,J) = vhh(i,J)*segment%tr_Reg%Tr(m)%OBC_inflow_conc ; endif
                 enddo