av5282/start/init5282.c: Address set but unused warnings

GCC 16 flagged this while GCC 15 did not. Because the code was
using the "temp" variable in what appeared to be delay loops,
added the "(void) temp" hint to avoid the warning.

bsps/m68k/av5282/start/init5282.c

@@ -100,4 +100,9 @@ void Init5282 (void)
      * Copy data, clear BSS and call boot_card()
      */
     CopyDataClearBSSAndStart ();
+
+    /*
+     * temp is really not used but tell the compiler it is.
+     */
+    (void) temp;
 }