Fix "frist", "fisrt", typos

Signed-off-by: Uwe Zeisberger <Uwe_Zeisberger@digi.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 89b2683..83f5c59 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -326,7 +326,7 @@
  *	platform_device_unregister - unregister a platform-level device
  *	@pdev:	platform device we're unregistering
  *
- *	Unregistration is done in 2 steps. Fisrt we release all resources
+ *	Unregistration is done in 2 steps. First we release all resources
  *	and remove it from the subsystem, then we drop reference count by
  *	calling platform_device_put().
  */