rtc: 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 1f33c41c03da ("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>
diff --git a/drivers/rtc/rtc-mrst.c b/drivers/rtc/rtc-mrst.c
index 3a6fd3a..548ea6f 100644
--- a/drivers/rtc/rtc-mrst.c
+++ b/drivers/rtc/rtc-mrst.c
@@ -277,13 +277,15 @@
 	valid = vrtc_cmos_read(RTC_VALID);
 	spin_unlock_irq(&rtc_lock);
 
-	return seq_printf(seq,
-			"periodic_IRQ\t: %s\n"
-			"alarm\t\t: %s\n"
-			"BCD\t\t: no\n"
-			"periodic_freq\t: daily (not adjustable)\n",
-			(rtc_control & RTC_PIE) ? "on" : "off",
-			(rtc_control & RTC_AIE) ? "on" : "off");
+	seq_printf(seq,
+		   "periodic_IRQ\t: %s\n"
+		   "alarm\t\t: %s\n"
+		   "BCD\t\t: no\n"
+		   "periodic_freq\t: daily (not adjustable)\n",
+		   (rtc_control & RTC_PIE) ? "on" : "off",
+		   (rtc_control & RTC_AIE) ? "on" : "off");
+
+	return 0;
 }
 
 #else