8331791: [8u] AIX build break from JDK-8320005 backport

Reviewed-by: sgehwolf

hotspot/src/os/aix/vm/os_aix.cpp

@@ -1480,10 +1480,11 @@ static void* dll_load_library(const char *filename, char *ebuf, int ebuflen) {
   }
   return NULL;
 }
+
 // Load library named <filename>
 // If filename matches <name>.so, and loading fails, repeat with <name>.a.
 void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
-  void* result = nullptr;
+  void* result = NULL;
   char* const file_path = strdup(filename);
   char* const pointer_to_dot = strrchr(file_path, '.');
   const char old_extension[] = ".so";
@@ -1493,11 +1494,11 @@ void *os::dll_load(const char *filename, char *ebuf, int ebuflen) {
   result = dll_load_library(filename, ebuf, ebuflen);
   // If the load fails,we try to reload by changing the extension to .a for .so files only.
   // Shared object in .so format dont have braces, hence they get removed for archives with members.
-  if (result == nullptr && pointer_to_dot != nullptr && strcmp(pointer_to_dot, old_extension) == 0) {
+  if (result == NULL && pointer_to_dot != NULL && strcmp(pointer_to_dot, old_extension) == 0) {
     snprintf(pointer_to_dot, sizeof(old_extension), "%s", new_extension);
     result = dll_load_library(file_path, ebuf, ebuflen);
   }
-  FREE_C_HEAP_ARRAY(char, file_path);
+  FREE_C_HEAP_ARRAY(char, file_path, mtInternal);
   return result;
 }