ipc: remove use of seq_printf return value

The seq_printf return value, because it's frequently misused,
will eventually be converted to void.

See: commit 1f33c41c ("seq_file: Rename seq_overflow() to
     seq_has_overflowed() and make public")
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

ipc/msg.c

@@ -1015,7 +1015,7 @@ static int sysvipc_msg_proc_show(struct seq_file *s, void *it)
 	struct user_namespace *user_ns = seq_user_ns(s);
 	struct msg_queue *msq = it;
 
-	return seq_printf(s,
+	seq_printf(s,
 		   "%10d %10d  %4o  %10lu %10lu %5u %5u %5u %5u %5u %5u %10lu %10lu %10lu\n",
 		   msq->q_perm.key,
 		   msq->q_perm.id,
@@ -1031,6 +1031,8 @@ static int sysvipc_msg_proc_show(struct seq_file *s, void *it)
 		   msq->q_stime,
 		   msq->q_rtime,
 		   msq->q_ctime);
+
+	return 0;
 }
 #endif
 

ipc/sem.c

@@ -2170,7 +2170,7 @@ static int sysvipc_sem_proc_show(struct seq_file *s, void *it)
 
 	sem_otime = get_semotime(sma);
 
-	return seq_printf(s,
+	seq_printf(s,
 		   "%10d %10d  %4o %10u %5u %5u %5u %5u %10lu %10lu\n",
 		   sma->sem_perm.key,
 		   sma->sem_perm.id,
@@ -2182,5 +2182,7 @@ static int sysvipc_sem_proc_show(struct seq_file *s, void *it)
 		   from_kgid_munged(user_ns, sma->sem_perm.cgid),
 		   sem_otime,
 		   sma->sem_ctime);
+
+	return 0;
 }
 #endif

ipc/shm.c

@@ -1342,7 +1342,7 @@ static int sysvipc_shm_proc_show(struct seq_file *s, void *it)
 #define SIZE_SPEC "%21lu"
 #endif
 
-	return seq_printf(s,
+	seq_printf(s,
 		   "%10d %10d  %4o " SIZE_SPEC " %5u %5u  "
 		   "%5lu %5u %5u %5u %5u %10lu %10lu %10lu "
 		   SIZE_SPEC " " SIZE_SPEC "\n",
@@ -1362,5 +1362,7 @@ static int sysvipc_shm_proc_show(struct seq_file *s, void *it)
 		   shp->shm_ctim,
 		   rss * PAGE_SIZE,
 		   swp * PAGE_SIZE);
+
+	return 0;
 }
 #endif

ipc/util.c

@@ -837,8 +837,10 @@ static int sysvipc_proc_show(struct seq_file *s, void *it)
 	struct ipc_proc_iter *iter = s->private;
 	struct ipc_proc_iface *iface = iter->iface;
 
-	if (it == SEQ_START_TOKEN)
-		return seq_puts(s, iface->header);
+	if (it == SEQ_START_TOKEN) {
+		seq_puts(s, iface->header);
+		return 0;
+	}
 
 	return iface->show(s, it);
 }