typo fixes: mecanism -> mechanism

Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/include/asm-powerpc/of_device.h b/include/asm-powerpc/of_device.h
index 6249a7c..c5c0b0b 100644
--- a/include/asm-powerpc/of_device.h
+++ b/include/asm-powerpc/of_device.h
@@ -9,7 +9,7 @@
 /*
  * The of_platform_bus_type is a bus type used by drivers that do not
  * attach to a macio or similar bus but still use OF probing
- * mecanism
+ * mechanism
  */
 extern struct bus_type of_platform_bus_type;