seq_file: Simplify __seq_puts()

Change the implementation of the out-of-line __seq_puts() to simply be
a seq_write() call instead of duplicating the overflow/memcpy logic.

Suggested-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/7cebc1412d8d1338a7e52cc9291d00f5368c14e4.1713781332.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Christian Brauner <brauner@kernel.org>

fs/seq_file.c

@@ -671,14 +671,7 @@ EXPORT_SYMBOL(seq_putc);
 
 void __seq_puts(struct seq_file *m, const char *s)
 {
-	int len = strlen(s);
-
-	if (m->count + len >= m->size) {
-		seq_set_overflow(m);
-		return;
-	}
-	memcpy(m->buf + m->count, s, len);
-	m->count += len;
+	seq_write(m, s, strlen(s));
 }
 EXPORT_SYMBOL(__seq_puts);