Explicitly instantiate string with source filename

src/ipc_debug.cpp

@@ -215,7 +215,9 @@ void debug_ipc_assert_equal_array(void *value, size_t size) {
 }
 
 void debug_ipc_assert_source_location(const char *source_file, const long int line_number) {
-    debug_ipc_assert_equal(std::string(source_file));
+    std::string fname(source_file);
+
+    debug_ipc_assert_equal(fname);
     debug_ipc_assert_equal(line_number);
 }