logging: shut up compiler warnings about unused result from write(2)

We actually don't care about the result here.  But we do in other
places, so we want to keep the warning in general.

src/mm-log.c

@@ -112,7 +112,7 @@ _mm_log (const char *loc,
         if (logfd < 0)
             syslog (syslog_priority, "%s", msgbuf);
         else {
-            write (logfd, msgbuf, strlen (msgbuf));
+            (void) write (logfd, msgbuf, strlen (msgbuf));
             fsync (logfd);  /* Make sure output is dumped to disk immediately */
         }
     }
@@ -153,7 +153,7 @@ log_handler (const gchar *log_domain,
     if (logfd < 0)
         syslog (syslog_priority, "%s", message);
     else
-        write (logfd, message, strlen (message));
+        (void) write (logfd, message, strlen (message));
 }
 
 gboolean