zero i_uid/i_gid on inode allocation

... and don't bother in callers.  Don't bother with zeroing i_blocks,
while we are at it - it's already been zeroed.

i_mode is not worth the effort; it has no common default value.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/romfs/inode.c

@@ -524,7 +524,6 @@ romfs_iget(struct super_block *sb, unsigned long ino)
 	i->i_size = be32_to_cpu(ri.size);
 	i->i_mtime.tv_sec = i->i_atime.tv_sec = i->i_ctime.tv_sec = 0;
 	i->i_mtime.tv_nsec = i->i_atime.tv_nsec = i->i_ctime.tv_nsec = 0;
-	i->i_uid = i->i_gid = 0;
 
         /* Precalculate the data offset */
         ino = romfs_strnlen(i, ino+ROMFH_SIZE, ROMFS_MAXFN);