spelling fixes: arch/sh64/

Spelling fixes in arch/sh64/.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh64/kernel/process.c b/arch/sh64/kernel/process.c
index 525d0ec..1b89c9d 100644
--- a/arch/sh64/kernel/process.c
+++ b/arch/sh64/kernel/process.c
@@ -387,7 +387,7 @@
  * NOTE! Only a kernel-only process(ie the swapper or direct descendants
  * who haven't done an "execve()") should use this: it will work within
  * a system call from a "real" process, but the process memory space will
- * not be free'd until both the parent and the child have exited.
+ * not be freed until both the parent and the child have exited.
  */
 int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
 {