Use __e for errno

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/filesetup.c b/filesetup.c
index 15c4316..17bdd26 100644
--- a/filesetup.c
+++ b/filesetup.c
@@ -436,7 +436,7 @@
 		char buf[FIO_VERROR_SIZE];
 		int __e = errno;
 
-		if (errno == EPERM && (flags & FIO_O_NOATIME)) {
+		if (__e == EPERM && (flags & FIO_O_NOATIME)) {
 			flags &= ~FIO_O_NOATIME;
 			goto open_again;
 		}