quiet some warnings

modules/libcom/src/error/errSymLib.c

@@ -192,7 +192,7 @@ void errSymLookup(long status, char * pBuf, size_t bufLength)
 {
     const char* msg = errSymLookupInternal(status);
     if(msg) {
-        strncpy(pBuf, msg, bufLength);
+        strncpy(pBuf, msg, bufLength-1);
         pBuf[bufLength-1] = '\0';
         return;
     }