Fix various trivial compiler warnings

src/io.c

@@ -323,7 +323,7 @@ int io_urldecode(char *str) {
         switch(*current) {
         case '+':
             *dst++ = ' ';
-            *current++;
+            current++;
             break;
         case '%':
             /* This is rather brute force.  Maybe sscanf? */
@@ -2078,7 +2078,6 @@ int io_socket_write(IO_PRIVHANDLE *phandle, unsigned char *buf,uint32_t *len) {
     ssize_t byteswritten=0;
     uint32_t totalbytes;
     unsigned char *bufp;
-    long blocking = 0;
 
     ASSERT(phandle);
     ASSERT(phandle->private);

src/plugins/out-daap.c

@@ -344,6 +344,7 @@ void plugin_handler(WS_CONNINFO *pwsc) {
     }
 
     pi_log(E_DBG,"Tokenizing url\n");
+    save = NULL;
     while((ppi->uri_count < 10) && (token=strtok_r(string,"/",&save))) {
         string=NULL;
         ppi->uri_sections[ppi->uri_count++] = token;

src/plugins/rsp.c

@@ -197,6 +197,7 @@ void plugin_handler(WS_CONNINFO *pwsc) {
     memset((void*)&ppi->dq,0,sizeof(DB_QUERY));
 
     pi_log(E_DBG,"Tokenizing url\n");
+    save = NULL;
     while((ppi->uri_count < 10) && (token=strtok_r(string,"/",&save))) {
         string=NULL;
         ppi->uri_sections[ppi->uri_count++] = token;

src/plugins/ssc-ffmpeg.c

@@ -223,7 +223,7 @@ int ssc_ffmpeg_open(void *vp, MP3FILE *pmp3) {
 
         }
 
-        if(strncmp(id3.id,"ID3",3)==0) {
+        if(strncmp((char *)id3.id,"ID3",3)==0) {
             /* found an ID3 header... */
             pi_log(E_DBG,"Found ID3 header\n");
             size = (id3.size[0] << 21 | id3.size[1] << 14 |

src/redblack.c

@@ -146,7 +146,6 @@ RB_STATIC struct RB_ENTRY(tree) *RB_ENTRY(init)(void)
 #endif /* RB_CUSTOMIZE */
 {
         struct RB_ENTRY(tree) *retval;
-        char c;
 
         if ((retval=(struct RB_ENTRY(tree) *) malloc(sizeof(struct RB_ENTRY(tree))))==NULL)
                 return(NULL);

src/scan-mpc.c

@@ -42,7 +42,6 @@
  * @returns TRUE if file should be added to DB, FALSE otherwise
  */
 int scan_get_mpcinfo(char *filename, MP3FILE *pmp3) {
-    FILE *f;
     TagLib_File *file;
     TagLib_Tag *tag;
     const TagLib_AudioProperties *properties;