metex14: Fix parsing of spaces.

When the parser found a space, it treated it as an invalid digit
and discarded the whole packet. This behavior was incorrect on
2000 count devices, where the first digit can be sent as a space
rather than a '0'.

Convert spaces to '0' and parse them as usual.

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>

hardware/common/dmm/metex14.c

@@ -75,6 +75,9 @@ static int parse_value(const uint8_t *buf, float *result)
 	factor = 1000;
 	for (i = 0; i < 5; i++) {
 		digit = buf[4 + i];
+		/* Convert spaces to '0', so that we can parse them. */
+		if (digit == ' ')
+			digit = '0';
 		if (digit == '.') {
 			decimal_point = i;
 		} else if (isdigit(digit)) {