030-iob: increase number of specimens

Signed-off-by: Alessandro Comodi <acomodi@antmicro.com>

fuzzers/030-iob/Makefile

diff --git a/fuzzers/030-iob/Makefile b/fuzzers/030-iob/Makefile
index a104b36..56191e3 100644
--- a/fuzzers/030-iob/Makefile
+++ b/fuzzers/030-iob/Makefile
@@ -5,7 +5,7 @@
 # https://opensource.org/licenses/ISC
 #
 # SPDX-License-Identifier: ISC
-N := 20
+N := 40
 SPECIMENS_DEPS := build/iobanks.txt
 include ../fuzzer.mk