Fixes the following warnings:
rpcd/sys.c: In function 'rpc_cgi_password_set':
rpcd/sys.c:116:8: error: ignoring return value of 'chdir', declared with attribute warn_unused_result [-Werror=unused-result]
chdir("/");
^
rpcd/sys.c:125:8: error: ignoring return value of 'write', declared with attribute warn_unused_result [-Werror=unused-result]
write(fds[1], blobmsg_data(tb[RPC_P_PASSWORD]),
^
rpcd/sys.c:127:8: error: ignoring return value of 'write', declared with attribute warn_unused_result [-Werror=unused-result]
write(fds[1], "\n", 1);
^
rpcd/sys.c:131:8: error: ignoring return value of 'write', declared with attribute warn_unused_result [-Werror=unused-result]
write(fds[1], blobmsg_data(tb[RPC_P_PASSWORD]),
^
rpcd/sys.c:133:8: error: ignoring return value of 'write', declared with attribute warn_unused_result [-Werror=unused-result]
write(fds[1], "\n", 1);
^
cc1: all warnings being treated as errors
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
