tests: Fix warnings in config-parser-test
diff --git a/tests/config-parser-test.c b/tests/config-parser-test.c
index 12a8fbd..83e89ba 100644
--- a/tests/config-parser-test.c
+++ b/tests/config-parser-test.c
@@ -25,6 +25,7 @@
 #include <string.h>
 #include <assert.h>
 #include <errno.h>
+#include <unistd.h>
 
 #include "config-parser.h"
 
@@ -37,7 +38,7 @@
 
 	fd = mkstemp(file);
 	len = write(fd, text, strlen(text));
-	assert(len == strlen(text));
+	assert(len == (int) strlen(text));
 
 	config = weston_config_parse(fd);
 	close(fd);