opal: Fix opal_initialized reference counter

Before this change, the reference counters `opal_util_initialized`
and `opal_initialized` were incremented at the beginning of the
`opal_init_util` and the `opal_init` functions respectively.
In other words, they were incremented before fully initialized.

This causes the following program to abort by SIGFPE if
`--enable-timing` is enabled on `configure`.

```c
// need -lm option on link

int main(int argc, char *argv[])
{
    // raise SIGFPE on division-by-zero
    feenableexcept(FE_DIVBYZERO);
    MPI_Init(&argc, &argv);
    MPI_Finalize();
    return 0;
}
```

The logic of the SIGFPE is:

1. `MPI_Init` calls `opal_init` through `ompi_rte_init`.
2. `opal_init` changes the value of `opal_initialized` to 1.
3. `opal_init` calls `opal_init_util`.
4. `opal_init_util` calls `opal_timing_ts_func` through
   `OPAL_TIMING_ENV_INIT`, and `opal_timing_ts_func` returns
   `get_ts_cycle` instead of `get_ts_gettimeofday` because
   `opal_initialized` to 1.
   (This is the problem)
5. `opal_init_util` calls `get_ts_cycle` through
   `OPAL_TIMING_ENV_INIT`.
6. `get_ts_cycle` executes
   `opal_timer_base_get_cycles()) / opal_timer_base_get_freq()`
   and it raises SIGFPE (division-by-zero) because the OPAL TIMER
   framework is not initialized yet and `opal_timer_base_get_freq`
   returns 0.

This commit changes the increment timing of `opal_util_initialized`
and `opal_initialized` to the end of `opal_init_util` and the
`opal_init` functions respectively.

Signed-off-by: Tsubasa Yanagibashi <fj2505dt@aa.jp.fujitsu.com>

opal/runtime/opal_init.c

@@ -24,6 +24,7 @@
  *                         All rights reserved.
  * Copyright (c) 2018-2019 Triad National Security, LLC. All rights
  *                         reserved.
+ * Copyright (c) 2020      FUJITSU LIMITED.  All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -470,10 +471,11 @@ opal_init_util(int* pargc, char*** pargv)
     char *error = NULL;
     OPAL_TIMING_ENV_INIT(otmng);
 
-    if( ++opal_util_initialized != 1 ) {
-        if( opal_util_initialized < 1 ) {
+    if( opal_util_initialized != 0 ) {
+        if( opal_util_initialized < 0 ) {
             return OPAL_ERROR;
         }
+        ++opal_util_initialized;
         return OPAL_SUCCESS;
     }
 
@@ -615,6 +617,8 @@ opal_init_util(int* pargc, char*** pargv)
 
     OPAL_TIMING_ENV_NEXT(otmng, "opal_if_init");
 
+    ++opal_util_initialized;
+
     return OPAL_SUCCESS;
 }
 
@@ -635,10 +639,11 @@ opal_init(int* pargc, char*** pargv)
 {
     int ret;
 
-    if( ++opal_initialized != 1 ) {
-        if( opal_initialized < 1 ) {
+    if( opal_initialized != 0 ) {
+        if( opal_initialized < 0 ) {
             return OPAL_ERROR;
         }
+        ++opal_initialized;
         return OPAL_SUCCESS;
     }
 
@@ -688,5 +693,7 @@ opal_init(int* pargc, char*** pargv)
         return opal_init_error ("opal_reachable_base_select", ret);
     }
 
+    ++opal_initialized;
+
     return OPAL_SUCCESS;
 }