nflog: improve error handling on NOBUFS

Don't fall through to handle_packet on any NOBUFS condition. Make
sure we catch all NOBUFS.

src/source-nflog.c

@@ -422,7 +422,8 @@ TmEcode ReceiveNFLOGLoop(ThreadVars *tv, void *data, void *slot)
             if (errno == EINTR || errno == EWOULDBLOCK) {
                 /*Nothing for us to process */
                 continue;
-            } else if (errno == ENOBUFS && !ntv->nful_overrun_warned) {
+            } else if (errno == ENOBUFS) {
+                if (!ntv->nful_overrun_warned) {
                     int s = ntv->nlbufsiz * 2;
                     if (NFLOGSetnlbufsiz((void *)ntv, s)) {
                         SCLogWarning(SC_WARN_NFLOG_LOSING_EVENTS,
@@ -432,6 +433,8 @@ TmEcode ReceiveNFLOGLoop(ThreadVars *tv, void *data, void *slot)
                     } else {
                         ntv->nful_overrun_warned = 1;
                     }
+                }
+                continue;
             } else {
                 SCLogWarning(SC_WARN_NFLOG_RECV,
                              "Read from NFLOG fd failed: %s",