Fix: Address a few benign memory leaks

This patch is the result of static analysis identifying a number of
memory leaks. The leaks are all benign as they are a result of not
deallocating memory in the desctructor. The fix still has value as it
removes false positives in the static analysis.

src/base/loader/hex_file.cc

@@ -56,6 +56,8 @@ HexFile::HexFile(const string _filename)
 
 HexFile::~HexFile()
 {
+    if (fp != NULL)
+        fclose(fp);
 }
 
 bool