C6X: fix KSTK_EIP and KSTK_ESP macros

There was a latent typo in the C6X KSTK_EIP and KSTK_ESP macros which
caused a problem with a new patch which used them. The broken definitions
were of the form:

  #define KSTK_FOO(tsk) (task_pt_regs(task)->foo)

Note the use of task vs tsk. This actually worked before because the
only place in the kernel which used these macros passed in a local
pointer named task.
Signed-off-by: Mark Salter <msalter@redhat.com>

arch/c6x/include/asm/processor.h

@@ -122,8 +122,8 @@ extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 
 extern unsigned long get_wchan(struct task_struct *p);
 
-#define KSTK_EIP(tsk)	(task_pt_regs(task)->pc)
-#define	KSTK_ESP(tsk)	(task_pt_regs(task)->sp)
+#define KSTK_EIP(task)	(task_pt_regs(task)->pc)
+#define KSTK_ESP(task)	(task_pt_regs(task)->sp)
 
 #define cpu_relax()		do { } while (0)