source: fix -Wshorten-64-to-32 warnings

Ticket: #6186

src/source-erf-file.c

@@ -158,7 +158,7 @@ static inline TmEcode ReadErfRecord(ThreadVars *tv, Packet *p, void *data)
     ErfFileThreadVars *etv = (ErfFileThreadVars *)data;
     DagRecord dr;
 
-    int r = fread(&dr, sizeof(DagRecord), 1, etv->erf);
+    size_t r = fread(&dr, sizeof(DagRecord), 1, etv->erf);
     if (r < 1) {
         if (feof(etv->erf)) {
             SCLogInfo("End of ERF file reached");

src/source-pcap.c

@@ -166,7 +166,7 @@ void TmModuleDecodePcapRegister (void)
 static inline void UpdatePcapStatsValue64(uint64_t *last, uint32_t current32)
 {
     /* uint64_t -> uint32_t is defined behaviour. It slices lower 32bits. */
-    uint32_t last32 = *last;
+    uint32_t last32 = (uint32_t)*last;
 
     /* Branchless code as wrap-around is defined for unsigned */
     *last += (uint32_t)(current32 - last32);