Remove some unused variables

- vainfo/vainfo.c
  Variables 'tmp' and 'file_size' in parse_args() were never used.

- common/va_display.c
  Variable 'device_name' was introduced at f36a392a96 but it was
  never used.

Signed-off-by: Victor Toso <victortoso@redhat.com>

common/va_display.c

@@ -124,7 +124,6 @@ void
 va_init_display_args(int *argc, char *argv[])
 {
     const char *display_name;
-    const char *device_name;
 
     display_name = get_display_name(*argc, argv);
     if (display_name && strcmp(display_name, "help") == 0) {

vainfo/vainfo.c

@@ -61,9 +61,8 @@ usage_exit(const char *program)
 static void
 parse_args(const char *name, int argc, char **argv)
 {
-    int c, tmp;
+    int c;
     int option_index = 0;
-    long file_size;
 
     static struct option long_options[] = {
         {"help",        no_argument,            0,      'h'},