GCC11 compiler compatibility

[amvarunn]

The GCC11 compiler throws the following warning.
Requesting to make necessary changes in source code to stop the warnings.
Thank you

/strongswan/davici/davici.c:797:27: error: 'req' may be used uninitialized in this function [-Werror=maybe-uninitialized]
  797 |                 cur->next = r;
      |                 ~~~~~~~~~~^~~
/strongswan/davici/davici.c:859:32: note: 'req' was declared here
  859 |         struct davici_request *req;
      |                                ^~~
/strongswan/davici/davici.c: In function 'davici_unregister':
/strongswan/davici/davici.c:797:27: error: 'req' may be used uninitialized in this function [-Werror=maybe-uninitialized]
  797 |                 cur->next = r;
      |                 ~~~~~~~~~~^~~
/strongswan/davici/davici.c:877:32: note: 'req' was declared here
  877 |         struct davici_request *req;
      |                                ^~~