[Ada] Fix computation of handle/pid lists in win32_wait

[Pierre-Marie de Rodat]

An obvious mistake due to missing parentheses was not properly computing the
size of the handle and pid list passed to WaitForMultipleObjects(). This
resulted in a memory corruption.

Tested on x86_64-pc-linux-gnu, committed on trunk

2018-05-23  Pascal Obry  <o...@adacore.com>

gcc/ada/

        * adaint.c (win32_wait): Add missing parentheses.
--- gcc/ada/adaint.c
+++ gcc/ada/adaint.c
@@ -2591,10 +2591,10 @@ win32_wait (int *status)
 #else
   /* Note that index 0 contains the event handle that is signaled when the
      process list has changed */
-  hl = (HANDLE *) xmalloc (sizeof (HANDLE) * hl_len + 1);
+  hl = (HANDLE *) xmalloc (sizeof (HANDLE) * (hl_len + 1));
   hl[0] = ProcListEvt;
   memmove (&hl[1], HANDLES_LIST, sizeof (HANDLE) * hl_len);
-  pidl = (int *) xmalloc (sizeof (int) * hl_len + 1);
+  pidl = (int *) xmalloc (sizeof (int) * (hl_len + 1));
   memmove (&pidl[1], PID_LIST, sizeof (int) * hl_len);
   hl_len++;
 #endif