off_t is always 64-bit with musl

--- a/tests/readahead.c
+++ b/tests/readahead.c
@@ -42,7 +42,7 @@ static const int fds[] = {
 	0x7fffffff,
 };
 
-static const off64_t offsets[] = {
+static const off_t offsets[] = {
 	-0x8000000000000000LL,
 	-0x5060708090a0b0c0LL,
 	-1LL,
--- a/tests/sync_file_range.c
+++ b/tests/sync_file_range.c
@@ -20,8 +20,8 @@ int
 main(void)
 {
 	const int fd = -1;
-	const off64_t offset = 0xdeadbeefbadc0dedULL;
-	const off64_t nbytes = 0xfacefeedcafef00dULL;
+	const off_t offset = 0xdeadbeefbadc0dedULL;
+	const off_t nbytes = 0xfacefeedcafef00dULL;
 	const unsigned int flags = -1;
 
 	int rc = sync_file_range(fd, offset, nbytes, flags);
--- a/tests/sync_file_range2.c
+++ b/tests/sync_file_range2.c
@@ -20,8 +20,8 @@ int
 main(void)
 {
 	const int fd = -1;
-	const off64_t offset = 0xdeadbeefbadc0ded;
-	const off64_t nbytes = 0xfacefeedcafef00d;
+	const off_t offset = 0xdeadbeefbadc0ded;
+	const off_t nbytes = 0xfacefeedcafef00d;
 	const unsigned int flags = -1;
 
 	int rc = sync_file_range(fd, offset, nbytes, flags);