Small parens-related warning with clang

clang carped about too many parens around (( a == b))

Fixes #1929
Signed-off-by: Pavan Balaji <balaji@mcs.anl.gov>

src/mpid/ch3/channels/nemesis/src/ch3_win_fns.c

@@ -85,7 +85,7 @@ static int MPIDI_CH3I_Win_allocate_shm(MPI_Aint size, int disp_unit, MPID_Info *
         char alloc_shared_nctg_value[MPI_MAX_INFO_VAL+1];
         MPIR_Info_get_impl(info, "alloc_shared_noncontig", MPI_MAX_INFO_VAL,
                            alloc_shared_nctg_value, &alloc_shared_nctg_flag);
-        if ((alloc_shared_nctg_flag == 1)) {
+        if (alloc_shared_nctg_flag == 1) {
             if (!strncmp(alloc_shared_nctg_value, "true", strlen("true")))
                 (*win_ptr)->info_args.alloc_shared_noncontig = 1;
             if (!strncmp(alloc_shared_nctg_value, "false", strlen("false")))