Get rid of abspath; Guard against --watch without user script

src/frida/repl.py

@@ -39,7 +39,7 @@ def main():
                 action='store_true', dest="watch", default=False)
 
         def _initialize(self, parser, options, args):
-            self._user_script = os.path.abspath(options.user_script)
+            self._user_script = options.user_script
             self._watch = options.watch
 
         def _usage(self):
@@ -57,13 +57,11 @@ def main():
                 self._exit(1)
                 return
 
-            if self._watch:
-                monitor = self._script_monitor
-                if monitor is None:
-                    monitor = frida.FileMonitor(self._user_script)
-                    monitor.on('change', self._on_change)
-                    monitor.enable()
-                    self._script_monitor = monitor
+            if self._user_script is not None and self._watch:
+                monitor = frida.FileMonitor(self._user_script)
+                monitor.on('change', self._on_change)
+                monitor.enable()
+                self._script_monitor = monitor
 
             if self._spawned_argv is not None:
                 self._update_status("Spawned `{command}`. Use %resume to let the main thread start executing!".format(command=" ".join(self._spawned_argv)))
@@ -81,7 +79,7 @@ def main():
                 pass
 
         def _stop(self):
-            if self._script_monitor != None:
+            if self._script_monitor is not None:
                 self._script_monitor.disable()
             self._unload_script()