Fixes memory leaks in the form of:
Direct leak of 24 byte(s) in 1 object(s) allocated from:
#0 0x7f5f7c2f4f30 in __interceptor_malloc (/usr/lib/x86_64-linux-gnu/libasan.so.5+0xedf30)
#1 0x563c799569f2 in ipc_recv_response ../common/ipc-client.c:94
#2 0x563c79957062 in ipc_single_command ../common/ipc-client.c:138
#3 0x563c798a56cc in run_as_ipc_client ../sway/main.c:127
#4 0x563c798a6a3a in main ../sway/main.c:349
#5 0x7f5f7b4d609a in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2409a)