[CIFS] small piece missing from previous patch

There were two i_size_writes in the new truncate
function - we missed one in the last patch.
Noticed by Shaggy when he reviewed.

Thank you Shaggy ...

CC: Shaggy <shaggy@us.ibm.com>
Signed-off-by: NSteve French <sfrench@us.ibm.com>

fs/cifs/inode.c

@@ -1139,15 +1139,17 @@ int cifs_vmtruncate(struct inode * inode, loff_t offset)
 	struct address_space *mapping = inode->i_mapping;
 	unsigned long limit;
 
+	spin_lock(&inode->i_lock);
 	if (inode->i_size < offset)
 		goto do_expand;
 	/*
 	 * truncation of in-use swapfiles is disallowed - it would cause
 	 * subsequent swapout to scribble on the now-freed blocks.
 	 */
-	if (IS_SWAPFILE(inode))
+	if (IS_SWAPFILE(inode)) {
+		spin_unlock(&inode->i_lock);
 		goto out_busy;
-	spin_lock(&inode->i_lock);		
+	}
 	i_size_write(inode, offset);
 	spin_unlock(&inode->i_lock);
 	unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
@@ -1156,12 +1158,16 @@ int cifs_vmtruncate(struct inode * inode, loff_t offset)
 
 do_expand:
 	limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
-	if (limit != RLIM_INFINITY && offset > limit)
+	if (limit != RLIM_INFINITY && offset > limit) {
+		spin_unlock(&inode->i_lock);
 		goto out_sig;
-	if (offset > inode->i_sb->s_maxbytes)
+	}
+	if (offset > inode->i_sb->s_maxbytes) {
+		spin_unlock(&inode->i_lock);
 		goto out_big;
+	}
 	i_size_write(inode, offset);
-
+	spin_unlock(&inode->i_lock);
 out_truncate:
 	if (inode->i_op && inode->i_op->truncate)
 		inode->i_op->truncate(inode);