spelling fixes: arch/um/

Spelling fixes in arch/um/.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Acked-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Adrian Bunk <bunk@kernel.org>

arch/um/sys-i386/tls.c

@@ -45,7 +45,7 @@ int do_get_thread_area(struct user_desc *info)
  * XXX: Consider leaving one free slot for glibc usage at first place. This must
  * be done here (and by changing GDT_ENTRY_TLS_* macros) and nowhere else.
  *
- * Also, this must be tested when compiling in SKAS mode with dinamic linking
+ * Also, this must be tested when compiling in SKAS mode with dynamic linking
  * and running against NPTL.
  */
 static int get_free_idx(struct task_struct* task)