broadcom-wl: fix compiler warning

Delete the return value (nvram_exit is declared with a 'void' return).

Signed-off-by: Nathan Hintz <nlhintz@hotmail.com>

SVN-Revision: 38747

package/kernel/broadcom-wl/patches/100-fix_nvram_two_devices.patch

@@ -25,7 +25,7 @@
  
 +	nvram_init_done--;
 +	if (nvram_init_done != 0)
-+		return 0;
++		return;
 +
  	sih = (si_t *)si;
  	this = vars;