Set the tc_quality field of the struct before calling tc_init(), since

the structure space had been obtained from malloc() its contents is
random garbage.  The choice of value being set is part of a larger effort
to solve some timecounter issues on MP machines (while working on that
we noticed this problem).

Noticed by:	marius
Reviewed by:	marius, green
MFC after:	3 days

sys/sparc64/sparc64/counter.c

@@ -37,6 +37,7 @@
 
 #define	COUNTER_MASK	((1 << 29) - 1)
 #define	COUNTER_FREQ	1000000
+#define	COUNTER_QUALITY	100
 
 /* Bits in the limit register. */
 #define	CTLR_INTEN	(1U << 31)	/* Enable timer interrupts */
@@ -94,6 +95,7 @@ sparc64_counter_init(bus_space_tag_t tag, bus_space_handle_t handle,
 	tc->tc_frequency = COUNTER_FREQ;
 	tc->tc_name = "counter-timer";
 	tc->tc_priv = sc;
+	tc->tc_quality = COUNTER_QUALITY;
 	tc_init(tc);
 }