esp32: fix smartconfig crash when no AP is found

Fix the bug that smartconfig crashes when no AP is found during smartconfig scan.

diff --git a/components/esp32/lib b/components/esp32/lib
index 2234fe822782ec9b69c2dd704d7ada7e621bafad..3e52d2e8f1819a9f2f6fe16c652a133f606debe4 160000 (submodule)
--- a/components/esp32/lib
+++ b/components/esp32/lib
@@ -1 +1 @@
-Subproject commit 2234fe822782ec9b69c2dd704d7ada7e621bafad
+Subproject commit 3e52d2e8f1819a9f2f6fe16c652a133f606debe4