FilePortion: force members initialization

This commit fixes a bug triggered by the fact that the constructor of
the `FilePortion` class was not initializing fields featuring a "native"
type (which are therefore not automatically zero-initialized).

In particular, this bug was triggered when dealing with a dynamic binary
lacking the sections for dynamic relocations.

binaryfile.cpp

@@ -248,6 +248,15 @@ BinaryFile::BinaryFile(std::string FilePath,
 }
 
 class FilePortion {
+private:
+  bool HasAddress;
+  bool HasSize;
+  uint64_t Size;
+  uint64_t Address;
+
+public:
+  FilePortion() : HasAddress(false), HasSize(false), Size(0), Address(0) { }
+
 public:
   void setAddress(uint64_t Address) {
     HasAddress = true;
@@ -305,12 +314,6 @@ public:
     abort();
   }
 
-private:
-  bool HasAddress;
-  bool HasSize;
-  uint64_t Size;
-  uint64_t Address;
-
 };
 
 template<typename T, bool HasAddend>