oracleasm: fix asmfs_dir_operations compiler error

oracleasm: fix asmfs_dir_operations compiler error

Using gcc7 (gcc version 7.2.1) on aarch64, the following error is produced:

drivers/block/oracleasm/driver.c:2385:55: error: positional initialization of
field in 'struct' declared with 'designated_init'
attribute [-Werror=designated-init]
 static struct file_operations asmfs_dir_operations = {0, };
                                                       ^
drivers/block/oracleasm/driver.c:2385:55: note: (
near initialization for 'asmfs_dir_operations')
cc1: some warnings being treated as errors

Initialization of asmfs_dir_operations happens in
init_asmfs_dir_operations, where asmfs_dir_operations is
initialized to simple_dir_operations.

Fix the above error, by removing superfluous static initialization line.

Orabug: 28506080

Signed-off-by: Tom Saeger <tom.saeger@oracle.com>
Reviewed-by: Somasundaram Krishnasamy <somasundaram.krishnasamy@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Brian Maly <brian.maly@oracle.com>