Always use unsigned char * for data buffers

Before this commit I was inconsistently using one of void *, char *
and uint8_t *.

1 files changed, 2 insertions, 1 deletions

diff --git a/tools/100_checkdata/checkdata.c b/tools/100_checkdata/checkdata.c
index cf42cbe..eefb063 100644
--- a/tools/100_checkdata/checkdata.c
+++ b/tools/100_checkdata/checkdata.c
@@ -6,7 +6,8 @@ char *solver, *filename;
 static void
 run(void) {
         long long int size, result;
-        char *buf, dataid[NISSY_SIZE_DATAID];
+        char dataid[NISSY_SIZE_DATAID];
+        unsigned char *buf;
         FILE *f;
         
         size = nissy_solverinfo(solver, dataid);