Fix shlib loaded: free memory, handle lib reload

- introduce loader_reset() that frees all memory
- resolve memory leak in loader_format_shlibpath()
- correctly handle library reload: check if a function has been
  retrieved already. Don't leak memory (strdup()), and handle multiple
  reloads of different functions from the same SO

openair1/SIMULATION/NR_PHY/dlschsim.c

@@ -29,6 +29,7 @@
 #include "common/config/config_userapi.h"
 #include "common/utils/LOG/log.h"
 #include "common/utils/LOG/vcd_signal_dumper.h"
+#include "common/utils/load_module_shlib.h"
 #include "T.h"
 #include "PHY/defs_gNB.h"
 #include "PHY/defs_nr_common.h"
@@ -671,6 +672,8 @@ int main(int argc, char **argv)
 	if (ouput_vcd)
         vcd_signal_dumper_close();
 
+  loader_reset();
+
 	return (n_errors);
 }