stacktrace: fix kernel-doc typo

Change @task to @tsk to prevent kernel-doc warnings:

kernel/stacktrace.c:138: warning: Excess function parameter 'task' description in 'stack_trace_save_tsk'
kernel/stacktrace.c:138: warning: Function parameter or member 'tsk' not described in 'stack_trace_save_tsk'

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Randy Dunlap <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: rddunlap

kernel/stacktrace.c

@@ -126,7 +126,7 @@ EXPORT_SYMBOL_GPL(stack_trace_save);
 
 /**
  * stack_trace_save_tsk - Save a task stack trace into a storage array
- * @task:	The task to examine
+ * @tsk:	The task to examine
  * @store:	Pointer to storage array
  * @size:	Size of the storage array
  * @skipnr:	Number of entries to skip at the start of the stack trace