9p: Add missing cast for the error return value in v9fs_get_inode

Cast the error return value (ENOMEM) in v9fs_get_inode() to its
correct type using ERR_PTR.

Signed-off-by: Abhishek Kulkarni <adkulkar@umail.iu.edu>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index fac30d2..06a223d 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -215,7 +215,7 @@
 	inode = new_inode(sb);
 	if (!inode) {
 		P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n");
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 	}
 
 	inode->i_mode = mode;