Fix misleading indentation warnings

Fixes the following warnings:

 lbp.c: In function 'lbp_send':
 lbp.c:43:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
    43 |     if (LBP_SENDRECV_DEBUG)
       |     ^~
 lbp.c:45:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
    45 |  return send;
       |  ^~~~~~
 lbp.c: In function 'lbp_recv':
 lbp.c:55:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
    55 |     if (LBP_SENDRECV_DEBUG)
       |     ^~
 lbp.c:57:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
    57 |  return recv;
       |  ^~~~~~

Signed-off-by: Damian Wrobel <dwrobel@ertelnet.rybnik.pl>