replace strncpy with BLI_strncpy, in some cases strncpy was being misused since it doesnt ensure \0 termination.

also dont call CTX_data_scene() twice when checking for function arguments.

source/blender/python/generic/bpy_internal_import.c

@@ -120,7 +120,7 @@ PyObject *bpy_text_import(Text *text)
 	}
 
 	len= strlen(text->id.name+2);
-	strncpy(modulename, text->id.name+2, len);
+	BLI_strncpy(modulename, text->id.name+2, len);
 	modulename[len - 3]= '\0'; /* remove .py */
 	return PyImport_ExecCodeModule(modulename, text->compiled);
 }