[IA64] fix build error - arch/ia64/kernel/perfmon.c

arch/ia64/kernel/perfmon.c:621: error: duplicate 'static'

Introduced by commit c74a1cbb

    pass default dentry_operations to mount_pseudo()
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/perfmon.c

@@ -618,7 +618,7 @@ pfm_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
 }
 
 /* forward declaration */
-static static const struct dentry_operations pfmfs_dentry_operations;
+static const struct dentry_operations pfmfs_dentry_operations;
 
 static struct dentry *
 pfmfs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data)