*: make "pragma GCC visibility push(hidden)" less ugly

e2fsprogs/old_e2fsprogs/ext2fs/ext2_io.h

@@ -9,9 +9,8 @@
  * License.
  * %End-Header%
  */
-
-#ifndef _EXT2FS_EXT2_IO_H
-#define _EXT2FS_EXT2_IO_H
+#ifndef EXT2FS_EXT2_IO_H
+#define EXT2FS_EXT2_IO_H 1
 
 /*
  * ext2_loff_t is defined here since unix_io.c needs it.
@@ -110,5 +109,4 @@ extern void (*test_io_cb_write_blk)
 extern void (*test_io_cb_set_blksize)
 	(int blksize, errcode_t err);
 
-#endif /* _EXT2FS_EXT2_IO_H */
-
+#endif