Bugfix: bitforce: Fix warning

driver-bitforce.c

@@ -299,7 +299,7 @@ static bool bitforce_init(struct cgpu_info *bitforce)
 	if (likely((!memcmp(pdevbuf, ">>>ID: ", 7)) && (s = strstr(pdevbuf + 3, ">>>"))))
 	{
 		s[0] = '\0';
-		free(bitforce->name);
+		free((void*)bitforce->name);
 		bitforce->name = strdup(pdevbuf + 7);
 	}