gdbstub: Zero-initialize sockaddr structs

Zero-initialize sockaddr_in and sockaddr_un structs that we're about
to fill in and pass to bind() or connect(), to ensure we don't leave
possible implementation-defined extension fields as uninitialized
garbage.

Signed-off-by: Peter Maydell <[email protected]>
Reviewed-by: Eric Blake <[email protected]>
Message-id: [email protected]

Author: pm215

gdbstub.c

@@ -3218,7 +3218,7 @@ static bool gdb_accept_socket(int gdb_fd)
 
 static int gdbserver_open_socket(const char *path)
 {
-    struct sockaddr_un sockaddr;
+    struct sockaddr_un sockaddr = {};
     int fd, ret;
 
     fd = socket(AF_UNIX, SOCK_STREAM, 0);
@@ -3247,7 +3247,7 @@ static int gdbserver_open_socket(const char *path)
 
 static bool gdb_accept_tcp(int gdb_fd)
 {
-    struct sockaddr_in sockaddr;
+    struct sockaddr_in sockaddr = {};
     socklen_t len;
     int fd;