[SPARC64]: Spelling fixes.

Spelling fixes in arch/sparc64/.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc64/kernel/prom.c b/arch/sparc64/kernel/prom.c
index b7976b1..02830e4 100644
--- a/arch/sparc64/kernel/prom.c
+++ b/arch/sparc64/kernel/prom.c
@@ -899,7 +899,7 @@
 	/* The interrupt map registers do not have an INO field
 	 * like other chips do.  They return zero in the INO
 	 * field, and the interrupt controller number is controlled
-	 * in bits 6 thru 9.  So in order for build_irq() to get
+	 * in bits 6 to 9.  So in order for build_irq() to get
 	 * the INO right we pass it in as part of the fixup
 	 * which will get added to the map register zero value
 	 * read by build_irq().