x86 boot code comments typos

Fix comments typos in new x86 boot code.

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
diff --git a/arch/i386/boot/pm.c b/arch/i386/boot/pm.c
index 1df025c..6be9ca8 100644
--- a/arch/i386/boot/pm.c
+++ b/arch/i386/boot/pm.c
@@ -80,7 +80,7 @@
  */
 static void mask_all_interrupts(void)
 {
-	outb(0xff, 0xa1);	/* Mask all interrupts on the seconday PIC */
+	outb(0xff, 0xa1);	/* Mask all interrupts on the secondary PIC */
 	io_delay();
 	outb(0xfb, 0x21);	/* Mask all but cascade on the primary PIC */
 	io_delay();