wsd: free leaking memory

With help from Valgrind to find and verify
these leaks.

Change-Id: I3afeed89dc4bcd714a222f81822144477a346fb0
Reviewed-on: https://gerrit.libreoffice.org/39464
Reviewed-by: Ashod Nakashian <ashnakash@gmail.com>
Tested-by: Ashod Nakashian <ashnakash@gmail.com>

net/Socket.hpp

@@ -615,6 +615,10 @@ private:
 
             // Invoke the virtual implementation.
             pollingThread();
+
+            // Release sockets.
+            _pollSockets.clear();
+            _newSockets.clear();
         }
         catch (const std::exception& exc)
         {

net/Ssl.cpp

@@ -123,6 +123,7 @@ SslContext::SslContext(const std::string& certFilePath,
 
 SslContext::~SslContext()
 {
+    SSL_CTX_free(_ctx);
     EVP_cleanup();
     ERR_free_strings();
     CRYPTO_set_locking_callback(0);

wsd/FileServer.hpp

@@ -31,6 +31,9 @@ public:
     /// Read all files that we can serve into memory and compress them.
     static void initialize();
 
+    /// Clean cached files.
+    static void uninitialize() { FileHash.clear(); }
+
     static void readDirToHash(const std::string &basePath, const std::string &path);
 
     static const std::string *getCompressedFile(const std::string &path);

wsd/LOOLWSD.cpp

@@ -2672,6 +2672,8 @@ int LOOLWSD::innerMain()
 
 void LOOLWSD::cleanup()
 {
+    FileServerRequestHandler::uninitialize();
+
     // Finally, we no longer need SSL.
     if (LOOLWSD::isSSLEnabled())
     {