Check the return code from setsockopt (in lirc.cpp)

Static analysis (coverity) identified that the return code
from setsockopt was not checked.  This patch checks the
return code, with a log message if the setting fails.
(cherry picked from commit 0ae45b8)

Signed-off-by: Stuart Morgan <smorgan@mythtv.org>

Fixes #11550

mythtv/libs/libmythui/lirc.cpp

@@ -274,9 +274,21 @@ bool LIRC::Init(void)
 
         // Attempt to inline out-of-band messages and keep the connection open..
         int i = 1;
-        setsockopt(lircd_socket, SOL_SOCKET, SO_OOBINLINE, &i, sizeof(i));
+        ret = setsockopt(lircd_socket, SOL_SOCKET, SO_OOBINLINE, &i, sizeof(i));
+        if (ret < 0)
+        {
+            LOG(VB_GENERAL, LOG_WARNING, LOC +
+                QString("Failed setting OOBINLINE option for socket '%1'")
+                    .arg(lircdDevice) + ENO);
+        }
         i = 1;
-        setsockopt(lircd_socket, SOL_SOCKET, SO_KEEPALIVE, &i, sizeof(i));
+        ret = setsockopt(lircd_socket, SOL_SOCKET, SO_KEEPALIVE, &i, sizeof(i));
+        if (ret < 0)
+        {
+            LOG(VB_GENERAL, LOG_WARNING, LOC +
+                QString("Failed setting KEEPALIVE option for socket '%1'")
+                    .arg(lircdDevice) + ENO);
+        }
     }
 
     d->lircState = lirc_init("/etc/lircrc", ".lircrc", "mythtv", NULL, 0);