add tmp variable to satisfy coverity before casting and assigning to word32 variable

Author: rlm2002

wolfcrypt/src/asn.c

@@ -42214,17 +42214,19 @@ static int EncodeCrlSerial(const byte* sn, word32 snSz, byte* output,
  */
 static word32 EncodeRevokedCert(byte* output, const RevokedCert* rc)
 {
+    int tmpSnSz;
     word32 idx = 0;
     word32 snSz, dateSz, seqSz;
     byte snBuf[MAX_SN_SZ];
     byte dateBuf[MAX_DATE_SIZE + 2]; /* tag + length + data */
     byte seqBuf[MAX_SEQ_SZ];
 
     /* Encode serial number */
-    snSz = (word32)EncodeCrlSerial(rc->serialNumber, (word32)rc->serialSz,
+    tmpSnSz = EncodeCrlSerial(rc->serialNumber, (word32)rc->serialSz,
                                    snBuf, sizeof(snBuf));
-    if ((int)snSz < 0)
+    if (tmpSnSz < 0)
         return 0;
+    snSz = (word32)tmpSnSz;
 
     /* Encode revocation date */
     dateSz = EncodeCrlDate(dateBuf, rc->revDate, rc->revDateFormat);
@@ -42255,6 +42257,7 @@ static word32 EncodeRevokedCert(byte* output, const RevokedCert* rc)
 static word32 EncodeCrlNumberExt(byte* output, const byte* crlNum,
                                   word32 crlNumSz)
 {
+    int tmpIntSz;
     word32 idx = 0;
     word32 oidSz, intSz, octetSz, seqSz;
     byte seqBuf[MAX_SEQ_SZ];
@@ -42266,9 +42269,10 @@ static word32 EncodeCrlNumberExt(byte* output, const byte* crlNum,
     oidSz = sizeof(crlNumOid);
 
     /* Encode the INTEGER for CRL number */
-    intSz = (word32)EncodeCrlSerial(crlNum, crlNumSz, intBuf, sizeof(intBuf));
-    if ((int)intSz < 0)
+    tmpIntSz = EncodeCrlSerial(crlNum, crlNumSz, intBuf, sizeof(intBuf));
+    if (tmpIntSz < 0)
         return 0;
+    intSz = (word32)tmpIntSz;
 
     /* Wrap INTEGER in OCTET STRING */
     octetSz = SetOctetString(intSz, octetBuf);