typo fixes: mecanism -> mechanism

Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/include/asm-powerpc/pmac_pfunc.h b/include/asm-powerpc/pmac_pfunc.h
index cef6130..1330d6a 100644
--- a/include/asm-powerpc/pmac_pfunc.h
+++ b/include/asm-powerpc/pmac_pfunc.h
@@ -205,7 +205,7 @@
  *
  * The args array contains as many arguments as is required by the function,
  * this is dependent on the function you are calling, unfortunately Apple
- * mecanism provides no way to encode that so you have to get it right at
+ * mechanism provides no way to encode that so you have to get it right at
  * the call site. Some functions require no args, in which case, you can
  * pass NULL.
  *