Fix incompatible pointer types by passing right buffer to
get_random_data()
https://bugs.gentoo.org/920156
--- a/audio-entropyd.c
+++ b/audio-entropyd.c
@@ -211,7 +211,7 @@
 
 void main_loop(const char *cdevice, int sample_rate)
 {
-	unsigned char *output_buffer = NULL;
+	char *output_buffer = NULL;
 	int n_output_bytes = -1;
 	int random_fd = -1, max_bits;
 	FILE *poolsize_fh;