Fix -Waddress-of-packed-member in explode.c

    explode.c: In function ‘libmpq__do_decompress_pkzip’:
    explode.c:542:73: warning: taking address of packed member of ‘struct <anonymous>’ may result in an unaligned pointer value [-Waddress-of-packed-member]
     542 |  mpq_pkzip->in_bytes   = mpq_pkzip->read_buf((char *)mpq_pkzip->in_buf, &mpq_pkzip->in_pos, mpq_pkzip->param);

libmpq/explode.c

@@ -538,8 +538,10 @@ uint32_t libmpq__do_decompress_pkzip(uint8_t *work_buf, void *param) {
 	mpq_pkzip->read_buf   = data_read_input;
 	mpq_pkzip->write_buf  = data_write_output;
 	mpq_pkzip->param      = param;
-	mpq_pkzip->in_pos     = sizeof(mpq_pkzip->in_buf);
-	mpq_pkzip->in_bytes   = mpq_pkzip->read_buf((char *)mpq_pkzip->in_buf, &mpq_pkzip->in_pos, mpq_pkzip->param);
+
+	uint32_t in_pos = sizeof(mpq_pkzip->in_buf);
+	mpq_pkzip->in_bytes = mpq_pkzip->read_buf((char *)mpq_pkzip->in_buf, &in_pos, mpq_pkzip->param);
+	mpq_pkzip->in_pos = in_pos;
 
 	/* check if we have pkzip data. */
 	if (mpq_pkzip->in_bytes <= 4) {