Always use unsigned char * for data buffers

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

1 files changed, 1 insertions, 2 deletions

diff --git a/tools/400_solvetest/solve_test.c b/tools/400_solvetest/solve_test.c
index a4121a5..a724320 100644
--- a/tools/400_solvetest/solve_test.c
+++ b/tools/400_solvetest/solve_test.c
@@ -5,8 +5,7 @@
 
 char *solver;
 int64_t size = 0;
-char *buf;
-
+unsigned char *buf;
 
 bool check_one(char *actual, char *expected) {
         unsigned i;