cifs: remove redundant initialization to variable mnt_sign_enabled

Variable mnt_sign_enabled is being initialized with a value that
is never read, it is being reassigned later on with a different
value. The initialization is redundant and can be removed.

Cleans up clang scan-build warning:
fs/cifs/cifssmb.c:465:7: warning: Value stored to 'mnt_sign_enabled
 during its initialization is never read
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/cifs/cifssmb.c

@@ -462,7 +462,7 @@ cifs_enable_signing(struct TCP_Server_Info *server, bool mnt_sign_required)
 {
 	bool srv_sign_required = server->sec_mode & server->vals->signing_required;
 	bool srv_sign_enabled = server->sec_mode & server->vals->signing_enabled;
-	bool mnt_sign_enabled = global_secflags & CIFSSEC_MAY_SIGN;
+	bool mnt_sign_enabled;
 
 	/*
 	 * Is signing required by mnt options? If not then check