diff.c: work around pointer constness warnings
The textconv leak fix introduced two invocations of free() to release
memory pointed by "const char *", which get annoying compiler warning.
diff --git a/diff.c b/diff.c
index db2cd5d..c23093d 100644
--- a/diff.c
+++ b/diff.c
@@ -551,9 +551,9 @@
if (lc_b)
emit_rewrite_lines(&ecbdata, '+', data_two, size_two);
if (textconv_one)
- free(data_one);
+ free((char *)data_one);
if (textconv_two)
- free(data_two);
+ free((char *)data_two);
}
struct diff_words_buffer {
