perf thread-stack: Eliminate code duplicating thread_stack__pop_ks()

Use new function thread_stack__pop_ks() in place of equivalent code.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/20190619064429.14940-3-adrian.hunter@intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/thread-stack.c

@@ -664,12 +664,9 @@ static int thread_stack__no_call_return(struct thread *thread,
 
 	if (ip >= ks && addr < ks) {
 		/* Return to userspace, so pop all kernel addresses */
-		while (thread_stack__in_kernel(ts)) {
-			err = thread_stack__call_return(thread, ts, --ts->cnt,
-							tm, ref, true);
-			if (err)
-				return err;
-		}
+		err = thread_stack__pop_ks(thread, ts, sample, ref);
+		if (err)
+			return err;
 
 		/* If the stack is empty, push the userspace address */
 		if (!ts->cnt) {
@@ -679,12 +676,9 @@ static int thread_stack__no_call_return(struct thread *thread,
 		}
 	} else if (thread_stack__in_kernel(ts) && ip < ks) {
 		/* Return to userspace, so pop all kernel addresses */
-		while (thread_stack__in_kernel(ts)) {
-			err = thread_stack__call_return(thread, ts, --ts->cnt,
-							tm, ref, true);
-			if (err)
-				return err;
-		}
+		err = thread_stack__pop_ks(thread, ts, sample, ref);
+		if (err)
+			return err;
 	}
 
 	if (ts->cnt)