misc/rand.c: cleanup and fix a stupid bug

src/misc/rand.c

@@ -123,6 +123,7 @@ void vlc_rand_bytes (void *buf, size_t len)
 {
     HCRYPTPROV hProv;
     size_t count = len;
+    uint8_t *p_buf = (uint8_t *)buf;
 
     /* fill buffer with pseudo-random data */
     while (count > 0)
@@ -131,12 +132,13 @@ void vlc_rand_bytes (void *buf, size_t len)
         val = rand();
         if (count < sizeof (val))
         {
-	    memcpy (buf, &val, count);
+            memcpy (p_buf, &val, count);
             break;
         }
         
-	memcpy (buf, &val, sizeof (val));
+        memcpy (p_buf, &val, sizeof (val));
         count -= sizeof (val);
+        p_buf += sizeof (val);
     }
 
     /* acquire default encryption context */