avoid compiler warnings

git-svn-id: https://svn.r-project.org/R/trunk@87166 00db46b3-68df-0310-9c12-caf00c1e9a41

src/library/tools/src/Rmd5.c

@@ -1,6 +1,6 @@
 /*
  * R : A Computer Language for Statistical Data Analysis
- * Copyright (C) 2003-2022 The R Core Team.
+ * Copyright (C) 2003-2024 The R Core Team.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -47,7 +47,7 @@ SEXP Rmd5(SEXP files)
  /* RAW mode: hash of one buffer instead of files */
  if (TYPEOF(files) == RAWSXP) {
  /* there is really no failure possible, but just in case... */
- if (!md5_buffer(RAW(files), XLENGTH(files), resblock))
+ if (!md5_buffer((char *) RAW(files), XLENGTH(files), resblock))
  return ScalarString(NA_STRING);
  for(j = 0; j < 16; j++)
  snprintf (out+2*j, 33-2*j, "%02x", resblock[j]);