nvram: fix nvram set invokation after r21497

SVN-Revision: 21517

package/nvram/files/nvram.init

@@ -57,7 +57,7 @@ fixup_linksys() {
 			[ "$SDRAM_INIT" -lt "9" -o "$SDRAM_INIT" -gt "17" ] && {
 				# set this to default: 0x09 only if value is invaild like 16MB on Asus WL-500GP
 				echo "sdram_init is invaild: $(printf 0x%04x $SDRAM_INIT), force to default!"
-				$(/usr/sbin/nvram_set sdram_init "0x0009")
+				nvram_set sdram_init 0x0009
 			}
 			[ "$COMMIT" = 1 ] && {
 				nvram_set sdram_ncdl 0x0