btrfs: remove unused condition check in btrfs_page_mkwrite()

The condition '!ret2' is always true. commit 717beb96 ("Btrfs: fix
regression in btrfs_page_mkwrite() from vm_fault_t conversion") left
behind the check after moving this code out of the goto, so remove the
unused condition check.
Reviewed-by: NOmar Sandoval <osandov@fb.com>
Signed-off-by: NYunfeng Ye <yeyunfeng@huawei.com>
Reviewed-by: NDavid Sterba <dsterba@suse.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>

fs/btrfs/inode.c

@@ -9099,7 +9099,6 @@ vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf)
 		ret = VM_FAULT_SIGBUS;
 		goto out_unlock;
 	}
-	ret2 = 0;
 
 	/* page is wholly or partially inside EOF */
 	if (page_start + PAGE_SIZE > size)
@@ -9123,12 +9122,10 @@ vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf)
 
 	unlock_extent_cached(io_tree, page_start, page_end, &cached_state);
 
-	if (!ret2) {
-		btrfs_delalloc_release_extents(BTRFS_I(inode), PAGE_SIZE);
-		sb_end_pagefault(inode->i_sb);
-		extent_changeset_free(data_reserved);
-		return VM_FAULT_LOCKED;
-	}
+	btrfs_delalloc_release_extents(BTRFS_I(inode), PAGE_SIZE);
+	sb_end_pagefault(inode->i_sb);
+	extent_changeset_free(data_reserved);
+	return VM_FAULT_LOCKED;
 
 out_unlock:
 	unlock_page(page);