Fix some errors and warnings from OpenBSD

activity_monitor.c

@@ -170,7 +170,6 @@ void *activity_monitor_thread_code(void *arg) {
 
   uint64_t sec;
   uint64_t nsec;
-  int rc;
   struct timespec time_for_wait;
 
   state = am_inactive;

common.c

@@ -450,7 +450,7 @@ char *base64_enc(uint8_t *input, int length) {
   b64 = BIO_push(b64, bmem);
   BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
   BIO_write(b64, input, length);
-  BIO_flush(b64);
+  (void) BIO_flush(b64);
   BIO_get_mem_ptr(b64, &bptr);
 
   char *buf = (char *)malloc(bptr->length);
@@ -482,7 +482,7 @@ uint8_t *base64_dec(char *input, int *outlen) {
   BIO_write(bmem, input, inlen);
   while (inlen++ & 3)
     BIO_write(bmem, "=", 1);
-  BIO_flush(bmem);
+  (void) BIO_flush(bmem);
 
   int bufsize = strlen(input) * 3 / 4 + 1;
   uint8_t *buf = malloc(bufsize);

shairport.c

@@ -31,7 +31,6 @@
 #include <libconfig.h>
 #include <libgen.h>
 #include <memory.h>
-#include <net/if.h>
 #include <popt.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -39,6 +38,7 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/wait.h>
+#include <net/if.h>
 #include <unistd.h>
 
 #include "config.h"