etc/Makefile: Remove empty newline

This was commited accidently in r347356 and cause distribution with
NO_ROOT set to fail.

Reported by:	ci, kib
MFC after:	2 weeks
X-MFC-With:	r347356

etc/Makefile

@@ -83,7 +83,6 @@ distribution:
 		echo "./etc/passwd type=file mode=0644 uname=root gname=wheel"; \
 		echo "./etc/pwd.db type=file mode=0644 uname=root gname=wheel"; \
 		echo "./etc/spwd.db type=file mode=0600 uname=root gname=wheel"; \
-
 	) | ${METALOG.add}
 .endif
 	${_+_}cd ${.CURDIR}/gss; ${MAKE} install