Fix spelling of 'platform' in log messages

Replace platfrom -> platform.

Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
index d84a36e..33f3541 100644
--- a/drivers/input/serio/i8042.c
+++ b/drivers/input/serio/i8042.c
@@ -430,7 +430,7 @@
 	}
 
 	if (i8042_platform_filter && i8042_platform_filter(data, str, serio)) {
-		dbg("Filtered out by platfrom filter\n");
+		dbg("Filtered out by platform filter\n");
 		return true;
 	}