UBI: rename peb_buf1 to peb_buf

Now we have only one buffer so let's rename it to just 'peb_buf1'.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 6e0806b..0fde9fc 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -945,8 +945,8 @@
 		goto out_free;
 
 	err = -ENOMEM;
-	ubi->peb_buf1 = vmalloc(ubi->peb_size);
-	if (!ubi->peb_buf1)
+	ubi->peb_buf = vmalloc(ubi->peb_size);
+	if (!ubi->peb_buf)
 		goto out_free;
 
 	err = ubi_debugging_init_dev(ubi);
@@ -1025,7 +1025,7 @@
 out_debugging:
 	ubi_debugging_exit_dev(ubi);
 out_free:
-	vfree(ubi->peb_buf1);
+	vfree(ubi->peb_buf);
 	if (ref)
 		put_device(&ubi->dev);
 	else
@@ -1096,7 +1096,7 @@
 	vfree(ubi->vtbl);
 	put_mtd_device(ubi->mtd);
 	ubi_debugging_exit_dev(ubi);
-	vfree(ubi->peb_buf1);
+	vfree(ubi->peb_buf);
 	ubi_msg("mtd%d is detached from ubi%d", ubi->mtd->index, ubi->ubi_num);
 	put_device(&ubi->dev);
 	return 0;