print: Fix vendor string memory leak

Freeing this string won't really matter in the incredible case that we
run out of memory, but it keeps Coverity happy.

Change-Id: I962d2f2227850473b70272bc48b3fc0a0fb11342
Signed-off-by: Jacob Garber <jgarber1@ualberta.ca>
Found-by: Coverity CID 1403822
Reviewed-on: https://review.coreboot.org/c/flashrom/+/34849
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: David Hendricks <david.hendricks@gmail.com>

print.c

@@ -184,6 +184,7 @@ static int print_supported_chips(void)
 		dev = malloc(strlen(chip->name) + 1);
 		if (dev == NULL) {
 			msg_gerr("Out of memory!\n");
+			free(ven);
 			return 1;
 		}
 		strcpy(dev, chip->name);