Fixes regarding memory management

Fixes assorted issues identified by valgrind.

src/request_body_processor/multipart.cc

@@ -92,9 +92,17 @@ Multipart::~Multipart() {
         }
     }
 
-    while (!m_parts.empty()) {
-        m_parts.pop_front();
+    while (m_parts.empty() == false) {
+        auto *a = m_parts.back();
+        m_parts.pop_back();
+        delete a;
     }
+
+    if (m_mpp != NULL) {
+        delete m_mpp;
+        m_mpp = NULL;
+    }
+
 }
 
 
@@ -734,9 +742,13 @@ int Multipart::process_part_header() {
                 return false;
             }
 
-            m_mpp->m_headers.insert({header_name, header_value});
             m_mpp->m_last_header_name.assign(header_name);
 
+
+            m_mpp->m_headers.emplace(
+                std::string(header_name), std::string(header_value));
+
+
             debug(9, "Multipart: Added part header \"" + header_name \
                 + "\" \"" + header_value + "\".");
         }
@@ -784,6 +796,7 @@ int Multipart::process_boundary(int last_part) {
             debug(3, "Multipart: Skipping invalid part (part name missing): "
                 "(offset " + std::to_string(m_mpp->m_offset) + ", length "
                 + std::to_string(m_mpp->m_length) + ")");
+            delete m_mpp;
         }
 
         m_mpp = NULL;

src/request_body_processor/multipart.h

@@ -54,13 +54,18 @@ struct MyEqual {
 
 class MultipartPart {
  public:
-     MultipartPart()
+    MultipartPart()
      : m_type(MULTIPART_FORMDATA),
      m_tmp_file_fd(0),
      m_tmp_file_size(0),
      m_offset(0),
      m_length(0) { }
 
+    ~MultipartPart () {
+        m_headers.clear();
+        m_value_parts.clear();
+    }
+
     /* part type, can be MULTIPART_FORMDATA or MULTIPART_FILE */
     int m_type;