loongson: fix cut-and-paste mis-merge

Ingo points out that I screwed up when merging the 'timers-for-linus'
branch in commit a03fdb7612.

A bit too much copy-and-pasting caused the end result to have an
extraneous 'return' in the middle of an expression.  That was obviously
bogus.  Blush.

Reported-by-with-patch: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/mips/loongson/common/time.c

@@ -23,6 +23,6 @@ void __init plat_time_init(void)
 
 void read_persistent_clock(struct timespec *ts)
 {
-	ts->tv_sec = return mc146818_get_cmos_time();
+	ts->tv_sec = mc146818_get_cmos_time();
 	ts->tv_nsec = 0;
 }