close stream after use

Bug: 240530709
Test: adb bugreport
Change-Id: I251a0f8a8e7d6a233b201a0a79df6c1bca137cd0
diff --git a/insmod/pixel_dump.cpp b/insmod/pixel_dump.cpp
index 3bf3d6e..aaaae01 100644
--- a/insmod/pixel_dump.cpp
+++ b/insmod/pixel_dump.cpp
@@ -98,6 +98,8 @@
     std::ifstream src(SrcDir, std::ios::binary);
     std::ofstream dst(DestDir, std::ios::binary);
     dst << src.rdbuf();
+    src.close();
+    dst.close();
     return;
 }