Add braces.

This commit was SVN r15155.

opal/util/output.c

@@ -293,8 +293,9 @@ void opal_output_close(int output_id)
             closelog();
         }
 #elif defined(__WINDOWS__)
-        if(info[output_id].ldi_syslog_ident != NULL)
+        if(info[output_id].ldi_syslog_ident != NULL) {
             DeregisterEventSource(info[output_id].ldi_syslog_ident);
+        }
 #endif
     }