Fix grab_file test after move from string module.

ccan/grab_file/test/run-grab.c

@@ -18,14 +18,14 @@ main(int argc, char *argv[])
 	int 		length;
 	struct 		stat st;
 
-	str = grab_file(NULL, "ccan/string/test/run-grab.c", NULL);
+	str = grab_file(NULL, "ccan/grab_file/test/run-grab.c", NULL);
 	split = strsplit(NULL, str, "\n", NULL);
 	length = strlen(split[0]);
 	ok1(streq(split[0], "/* This is test for grab_file() function"));
 	for (i = 1; split[i]; i++)	
 		length += strlen(split[i]);
 	ok1(streq(split[i-1], "/* End of grab_file() test */"));
-	if (stat("ccan/string/test/run-grab.c", &st) != 0) 
+	if (stat("ccan/grab_file/test/run-grab.c", &st) != 0) 
 		err(1, "Could not stat self");
 	ok1(st.st_size == length + i);