${top}: fix bug of living dead processes

This fixes a bug occurred with 0b3e3c637e5453c6a45fca2cb9af5839366290c8.
Dead processes still appeared in ${top} under FreeBSD and OpenBSD.  This was
because I forgot to update the g_time variable which is used as time stamp in
the process list.

Signed-off-by: Alexander Graf <agraf@znc.in>

src/linux.cc

@@ -2711,7 +2711,6 @@ static void update_process_table(void)
 	}
 
 	info.run_procs = 0;
-	++g_time;
 
 	/* Get list of processes from /proc directory */
 	while ((entry = readdir(dir))) {

src/top.cc

@@ -330,6 +330,12 @@ static void process_find_top(struct process **cpu, struct process **mem,
 	pq_set_max_size(io_queue, MAX_SP);
 #endif
 
+	/* g_time is the time_stamp entry for process.  It is updated when the
+	 * process information is updated to indicate that the process is still
+	 * alive (and must not be removed from the process list in
+	 * process_cleanup()) */
+	++g_time;
+
 	/* OS-specific function updating process list */
 	get_top_info();