Fixes *alltoall* collectives at top

- fix bugs
 - silent warnings

cmr=v1.8.2:ticket=4651:reviewer=bosilca

This commit was SVN r31831.

The following Trac tickets were found above:
  Ticket 4651 --> https://svn.open-mpi.org/trac/ompi/ticket/4651

ompi/mpi/c/alltoall.c

@@ -98,7 +98,7 @@ int MPI_Alltoall(const void *sendbuf, int sendcount, MPI_Datatype sendtype,
     ompi_datatype_type_size(recvtype, &recvtype_size);
     if (((MPI_IN_PLACE == sendbuf) ||
          (0 == sendcount) || (0 == sendtype_size)) &&
-        (0 == recvcount) || (0 == recvtype_size)) {
+        ((0 == recvcount) || (0 == recvtype_size))) {
         return MPI_SUCCESS;
     }
 

ompi/mpi/c/ialltoallv.c

@@ -50,7 +50,6 @@ int MPI_Ialltoallv(const void *sendbuf, const int sendcounts[], const int sdispl
 {
     int i, size, err;
     size_t sendtype_size, recvtype_size;
-    bool zerosend=true, zerorecv=true;
 
     MEMCHECKER(
         ptrdiff_t recv_ext;

ompi/mpi/c/ialltoallw.c

@@ -50,7 +50,6 @@ int MPI_Ialltoallw(const void *sendbuf, const int sendcounts[], const int sdispl
 {
     int i, size, err;
     size_t sendtype_size, recvtype_size;
-    bool zerosend=true, zerorecv=true;
 
     MEMCHECKER(
         ptrdiff_t recv_ext;

ompi/mpi/c/ineighbor_alltoallv.c

@@ -50,7 +50,6 @@ int MPI_Ineighbor_alltoallv(const void *sendbuf, const int sendcounts[], const i
 {
     int i, size, err;
     size_t sendtype_size, recvtype_size;
-    bool zerosend=true, zerorecv=true;
 
     MEMCHECKER(
         ptrdiff_t recv_ext;

ompi/mpi/c/ineighbor_alltoallw.c

@@ -50,7 +50,6 @@ int MPI_Ineighbor_alltoallw(const void *sendbuf, const int sendcounts[], const M
 {
     int i, size, err;
     size_t sendtype_size, recvtype_size;
-    bool zerosend=true, zerorecv=true;
 
     MEMCHECKER(
         ptrdiff_t recv_ext;

ompi/mpi/c/neighbor_alltoall.c

@@ -98,8 +98,8 @@ int MPI_Neighbor_alltoall(const void *sendbuf, int sendcount, MPI_Datatype sendt
     ompi_datatype_type_size(sendtype, &sendtype_size);
     ompi_datatype_type_size(recvtype, &recvtype_size);
     if (((MPI_IN_PLACE == sendbuf) ||
-         (0 == sendcount || 0 == sendtype_size)) &&
-        (0 == recvcount || 0 == recvtype_size)) {
+         (0 == sendcount) || (0 == sendtype_size)) &&
+        ((0 == recvcount) || 0 == (recvtype_size))) {
         return MPI_SUCCESS;
     }