fix unitialized usage issues - part 1

[jeffhammond]

the alloc_nproc issue causes the following error, which is now fixed.

jehammond@Jeffs-NVIDIA-MacBook-Air build % mpirun -n 2 ./tests/test_malloc
Starting ARMCI memory allocation test with 2 processes
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 + free 0
[0] ARMCI assert fail in ARMCI_Free_group() [../src/malloc.c:102]: "mreg != NULL"
[0] Message: "Invalid shared pointer"
[1] ARMCI assert fail in ARMCI_Free_group() [../src/malloc.c:102]: "mreg != NULL"
[1] Message: "Invalid shared pointer"
[0] Backtrace:
[0]   5 - 0   test_malloc                         0x000000010429ed5c ARMCII_Assert_fail + 304
[0]   4 - 1   test_malloc                         0x00000001042a017c ARMCI_Free_group + 116
[0]   3 - 2   test_malloc                         0x00000001042a00fc PARMCI_Free + 32
[0]   2 - 3   test_malloc                         0x00000001042ace64 ARMCI_Free + 24
[0]   1 - 4   test_malloc                         0x000000010429dd18 main + 400
[0]   0 - 5   libdyld.dylib                       0x0000000190875430 start + 4
[1] Backtrace:
[1]   5 - 0   test_malloc                         0x0000000102cb6d5c ARMCII_Assert_fail + 304
[1]   4 - 1   test_malloc                         0x0000000102cb817c ARMCI_Free_group + 116
[1]   3 - 2   test_malloc                         0x0000000102cb80fc PARMCI_Free + 32
[1]   2 - 3   test_malloc                         0x0000000102cc4e64 ARMCI_Free + 24
[1]   1 - 4   test_malloc                         0x0000000102cb5d18 main + 400
[1]   0 - 5   libdyld.dylib                       0x0000000190875430 start + 4
Abort(-1) on node 0 (rank 0 in comm 0): application called MPI_Abort(MPI_COMM_WORLD, -1) - process 0
Abort(-1) on node 1 (rank 1 in comm 0): application called MPI_Abort(MPI_COMM_WORLD, -1) - process 1