fix format strings

src/tus_file.c

@@ -564,7 +564,7 @@ tus_file_add(struct VPFX(tus_server) *srv, int basefd, const char *filename)
 	const char *err;
 
 	if (fstatat(basefd, filename, &st, AT_SYMLINK_NOFOLLOW)) {
-		fprintf(stderr, "tus add stat %s: %s\n", filename, errno);
+		fprintf(stderr, "tus add stat %s: %d\n", filename, errno);
 		goto err;
 	}
 
@@ -576,13 +576,13 @@ tus_file_add(struct VPFX(tus_server) *srv, int basefd, const char *filename)
 
 	fd = openat(basefd, filename, O_RDWR | O_CLOEXEC | O_APPEND);
 	if (fd < 0) {
-		fprintf(stderr, "tus add open %s: %s\n", filename, errno);
+		fprintf(stderr, "tus add open %s: %d\n", filename, errno);
 		goto err;
 	}
 
 	fdisk = tus_mmap_header(fd);
 	if (fdisk == NULL) {
-		fprintf(stderr, "tus add mmap %s: %s\n", filename, errno);
+		fprintf(stderr, "tus add mmap %s: %d\n", filename, errno);
 		goto err;
 	}