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path-cwd: throw an io error if getcwd failed

--- a/builtins.c

+++ b/builtins.c

@@ -366,11 +366,12 @@

 		argcount(nargs, 1);

 	if(nargs == 0){

 		char buf[1024];

-		getcwd(buf, sizeof(buf));

+		if(getcwd(buf, sizeof(buf)) == nil)

+			lerrorf(FL_IOError, "could not get current dir");

 		return string_from_cstr(buf);

 	}

 	char *ptr = tostring(args[0]);

-	if(chdir(ptr))

+	if(chdir(ptr) != 0)

 		lerrorf(FL_IOError, "could not cd to %s", ptr);

 	return FL_void;

 }