Declare unused parameters

When building with global CFLAGS=-Wunused-parameter the output from the
build looks terrible.  This commit explicitly declares unused variables
to prevent triggering -Wunused-parameter

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/cond-w.c

@@ -202,6 +202,9 @@ static int do_delete(const char *fpath, const struct stat *sb, int tflag, struct
 {
 	const char *cond, *ptr;
 
+	(void)sb;
+	(void)tflag;
+
 	if (ftw->level == 0)
 		return 1;
 
@@ -390,6 +393,8 @@ static int do_assert(const char *fpath, const struct stat *sb, int tflg, struct
 {
 	char *nm;
 
+	(void)sb;
+
 	if (ftw->level == 0)
 		return 1;