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 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>

drivers/rtc/rtc-cmos.c

@@ -459,7 +459,7 @@ static int cmos_procfs(struct device *dev, struct seq_file *seq)
 	/* NOTE:  at least ICH6 reports battery status using a different
 	 * (non-RTC) bit; and SQWE is ignored on many current systems.
 	 */
-	return seq_printf(seq,
+	seq_printf(seq,
 		   "periodic_IRQ\t: %s\n"
 		   "update_IRQ\t: %s\n"
 		   "HPET_emulated\t: %s\n"
@@ -476,6 +476,8 @@ static int cmos_procfs(struct device *dev, struct seq_file *seq)
 		   (rtc_control & RTC_DST_EN) ? "yes" : "no",
 		   cmos->rtc->irq_freq,
 		   (valid & RTC_VRT) ? "okay" : "dead");
+
+	return 0;
 }
 
 #else

drivers/rtc/rtc-ds1305.c

@@ -434,9 +434,9 @@ static int ds1305_proc(struct device *dev, struct seq_file *seq)
 	}
 
 done:
-	return seq_printf(seq,
-			"trickle_charge\t: %s%s\n",
-			diodes, resistors);
+	seq_printf(seq, "trickle_charge\t: %s%s\n", diodes, resistors);
+
+	return 0;
 }
 
 #else

drivers/rtc/rtc-mrst.c

@@ -277,13 +277,15 @@ static int mrst_procfs(struct device *dev, struct seq_file *seq)
 	valid = vrtc_cmos_read(RTC_VALID);
 	spin_unlock_irq(&rtc_lock);
 
-	return seq_printf(seq,
+	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

drivers/rtc/rtc-tegra.c

@@ -261,7 +261,9 @@ static int tegra_rtc_proc(struct device *dev, struct seq_file *seq)
 	if (!dev || !dev->driver)
 		return 0;
 
-	return seq_printf(seq, "name\t\t: %s\n", dev_name(dev));
+	seq_printf(seq, "name\t\t: %s\n", dev_name(dev));
+
+	return 0;
 }
 
 static irqreturn_t tegra_rtc_irq_handler(int irq, void *data)