nbd-client: Fix build on musl + gcc14
GCC-14 has promoted incompatible-pointer-types warning into error which is
now flagged especially with when building on musl
Fixes following error
| ../nbd-3.26.1/nbd-client.c: In function 'openunix':
| ../nbd-3.26.1/nbd-client.c:345:27: error: passing argument 2 of 'connect' from incompatible pointer type [-Wincompatible-pointer-types]
| 345 | if (connect(sock, &un_addr, sizeof(un_addr)) == -1) {
| | ^~~~~~~~
| | |
| | struct sockaddr_un *
| In file included from ../nbd-3.26.1/nbd-client.c:25:
| /mnt/b/yoe/master/build/tmp/work/core2-64-yoe-linux-musl/nbd/3.26.1/recipe-sysroot/usr/include/sys/socket.h:386:19: note: expected 'const struct sockaddr *' but argument is of type 'struct sockaddr_un *'
| 386 | int connect (int, const struct sockaddr *, socklen_t);
| | ^~~~~~~~~~~~~~~~~~~~~~~
Signed-off-by: Khem Raj <raj.khem@gmail.com>