[svn-r3137]

Purpose:
   kind of bug fix for windows
Description:
   Use HDfree() instead of free() so that it will not cause exceptions on windows dll
Solution:
Platforms tested:
    windows NT 4.0 and 5.0, confirmed at Linux box.

tools/h4toh5main.c

@@ -139,7 +139,7 @@ int main(int argc, char ** argv) {
 		  break;
 		}
 		if (h5_filename != NULL) {
-		   free(h5_filename);
+		   HDfree(h5_filename);
 		}
 
 		break;