proc: consoles: Add notation to c_start/c_stop

fs/proc/consoles.c:78:13: warning: context imbalance in 'c_start'
	- wrong count at exit
fs/proc/consoles.c:104:13: warning: context imbalance in 'c_stop'
	- unexpected unlock
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20240904120536.115780-13-john.ogness@linutronix.deSigned-off-by: Petr Mladek <pmladek@suse.com>

fs/proc/consoles.c

@@ -68,6 +68,7 @@ static int show_console_dev(struct seq_file *m, void *v)
 }
 
 static void *c_start(struct seq_file *m, loff_t *pos)
+	__acquires(&console_mutex)
 {
 	struct console *con;
 	loff_t off = 0;
@@ -94,6 +95,7 @@ static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 }
 
 static void c_stop(struct seq_file *m, void *v)
+	__releases(&console_mutex)
 {
 	console_list_unlock();
 }