Fix memory leak in test_realn.

Fix buffer overflow in `sam_parse1`.
Fixes #731.

Author: valeriuo

sam.c

@@ -1305,7 +1305,7 @@ int sam_parse1(kstring_t *s, bam_hdr_t *h, bam1_t *b)
         _get_mem(uint8_t, &t, &str, i);
         memset(t, 0, i);
         for (i = 0; i < c->l_qseq; ++i)
-            t[i>>1] |= seq_nt16_table[(int)q[i]] << ((~i&1)<<2);
+            t[i>>1] |= seq_nt16_table[(unsigned char)q[i]] << ((~i&1)<<2);
     } else c->l_qseq = 0;
     // qual
     q = _read_token_aux(p);

test/test_realn.c

@@ -164,5 +164,6 @@ int main(int argc, char **argv) {
     if (in) hts_close(in);
     if (out) hts_close(out);
     free(ref_seq);
+    fai_destroy(fai);
     return EXIT_FAILURE;
 }