util/nvramtool: Remove 2nd initialization

'result' is already defined as 'unsigned long long result = 0;' so no
need to re-write 'result = 0;'.

Change-Id: Ie897453fb5e7b09af755ce8d61ee8e80943ffc1c
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40290
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

util/nvramtool/cmos_lowlevel.c

@@ -121,7 +121,6 @@ unsigned long long cmos_read(const cmos_entry_t * e)
 	unsigned char value;
 
 	assert(!verify_cmos_op(bit, length, e->config));
-	result = 0;
 
 	if (e->config == CMOS_ENTRY_STRING) {
 		int strsz = (length + 7) / 8 + 1;