Fix compilation errors

Former-commit-id: 3513548d12c1dfcda3ca8d346e967e1bb4f4b337

tools/spasm/spasm.cpp

@@ -176,7 +176,7 @@ static uintptr_t getSymbolAddress(const string &symbolFilename, const string &sy
 bool fexists(const string &filename)
 {
 	ifstream ifile(filename.c_str());
-	return ifile;
+	return ifile.is_open();
 }
 
 

tools/spasm/spasm_main.cpp

@@ -31,7 +31,7 @@ using namespace std;
 bool fexists(string filename)
 {
 	ifstream ifile(filename.c_str());
-	return ifile;
+	return ifile.is_open();
 }
 
 void usage()