Fix invalid strncpy destination buffer size

`strncpy` function does not guaranty the zero-byte at the end of a destination
buffer in case of source string truncation so the limit should be less
that the destination size.

Relates #169

autotest/autotest.cpp

@@ -103,7 +103,7 @@ eResult tAutotest::initSockets()
 		}
 		struct sockaddr_un sockaddr;
 		sockaddr.sun_family = AF_UNIX;
-		strncpy(sockaddr.sun_path, pci.data() + strlen(SOCK_DEV_PREFIX), sizeof(sockaddr.sun_path));
+		strncpy(sockaddr.sun_path, pci.data() + strlen(SOCK_DEV_PREFIX), sizeof(sockaddr.sun_path) - 1);
 		if (connect(fd, (struct sockaddr*)&sockaddr, sizeof(sockaddr)) < 0)
 		{
 			YANET_LOG_ERROR("error: could not connect: %s\n", strerror(errno));

dataplane/sock_dev.cpp

@@ -446,7 +446,7 @@ int sock_dev_create(const char* name, uint8_t numa_node)
 	unlink(path);
 	internals->fd = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK, 0);
 	internals->sockaddr.sun_family = AF_UNIX;
-	strncpy(internals->sockaddr.sun_path, path, sizeof(internals->sockaddr.sun_path));
+	strncpy(internals->sockaddr.sun_path, path, sizeof(internals->sockaddr.sun_path) - 1);
 	bind(internals->fd, (struct sockaddr*)&internals->sockaddr, sizeof(internals->sockaddr));
 	listen(internals->fd, 1);
 	internals->conFd = -1;