update: Do not check if the whitelist is empty

Let the copy loop execute zero times instead of checking if
the whitelist is empty.

Suppressing the mount and copying the files can be achieved via
command line options.  This removes a condition and prepares for
splitting the whitelist into component files with support for
commented out lines.

Signed-off-by: Milton Miller <miltonm@us.ibm.com>
diff --git a/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-update.sh b/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-update.sh
index dff23d5..f40a546 100755
--- a/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-update.sh
+++ b/meta-phosphor/common/recipes-phosphor/obmc-phosphor-initfs/files/obmc-update.sh
@@ -90,7 +90,7 @@
 	esac
 done
 
-if test "x$dosave" = xy -a -n "$rwfs" -a -s whitelist
+if test "x$dosave" = xy -a -n "$rwfs"
 then
 	mkdir -p $rwdir
 	mount $rwdev $rwdir -t $(probe_fs_type $rwdev) -o $rorwopts