Address warnings

- Setting default values
- Fixing mismatched types
- Guarding unused var

libs/fst/fstapi.cc

@@ -5536,7 +5536,9 @@ char *fstReaderGetValueFromHandleAtTime(void *ctx, uint64_t tim, fstHandle facid
     fst_off_t blkpos = 0, prev_blkpos;
     uint64_t beg_tim, end_tim, beg_tim2, end_tim2;
     int sectype;
+#ifdef FST_DEBUG
     unsigned int secnum = 0;
+#endif
     uint64_t seclen;
     uint64_t tsec_uclen = 0, tsec_clen = 0;
     uint64_t tsec_nitems;
@@ -5620,7 +5622,9 @@ char *fstReaderGetValueFromHandleAtTime(void *ctx, uint64_t tim, fstHandle facid
         }
 
         blkpos += seclen;
+#ifdef FST_DEBUG
         secnum++;
+#endif
     }
 
     xc->rvat_beg_tim = beg_tim;