device_parser: fix out of bounds write

accept() expects the passed "scalar" to be 256 bytes long, so passing
the 80 char key will cause an out-of-range write.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

device_parser.c

@@ -148,7 +148,7 @@ static void parse_board(struct device_parser *dp)
 void device_parser(const char *path)
 {
 	struct device_parser dp;
-	char key[80];
+	char key[TOKEN_LENGTH];
 	FILE *fh;
 
 	fh = fopen(path, "r");