clover: Add constructor for clover::module.

Fix defect reported by Coverity Scan after commit 95527fe2
("clover/module: add a printf support to module (v5)").

Uninitialized scalar variable (UNINIT)
uninit_use_in_call: Using uninitialized value
m.printf_strings_in_buffer when calling module.

Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Francisco Jerez <currojerez@riseup.net>
Part-of: <!8322>
36 jobs for !8322 with fix-cid-1471681 in 5 minutes and 48 seconds (queued for 2 seconds)
detached
Status Job ID Name Coverage
  Sanity
passed #6551029
sanity

00:00:08

 
  Container
passed #6551032
aarch64
arm_build

00:00:20

passed #6551033
arm_test-base

00:00:11

passed #6551034
windows shell 1809 mesa
windows_build_vs2019

00:00:19

passed #6551030
x86_build-base

00:00:13

passed #6551031
x86_test-base

00:00:13

 
  Container 2
passed #6551042
android_build

00:00:15

passed #6551045
arm64_test

00:00:13

passed #6551046
armhf_test

00:00:17

passed #6551039
i386_build

00:00:17

passed #6551035
kernel+rootfs_amd64

00:00:21

passed #6551036
aarch64
kernel+rootfs_arm64

00:00:20

passed #6551037
aarch64
kernel+rootfs_armhf

00:00:19

passed #6551040
ppc64el_build

00:00:12

passed #6551041
s390x_build

00:00:17

passed #6551038
x86_build

00:00:16

passed #6551043
x86_test-gl

00:00:17

passed #6551044
x86_test-vk

00:00:16

 
  Meson X86 64
passed #6551052
meson-clang

00:02:17

passed #6551053
meson-clover

00:03:29

passed #6551049
meson-clover-testing

00:02:05

passed #6551050
meson-gallium

00:03:30

passed #6551051
meson-release

00:02:03

passed #6551047
meson-testing

00:02:21

passed #6551048
meson-testing-asan

00:02:35

passed #6551054
meson-vulkan

00:02:03

 
  Build Misc
passed #6551055
meson-android

00:01:49

passed #6551057
aarch64
meson-arm64

00:01:33

passed #6551058
aarch64
meson-arm64-build-test

00:01:30

passed #6551056
aarch64
meson-armhf

00:01:32

passed #6551060
meson-i386

00:02:21

passed #6551063
meson-mingw32-x86_64

00:02:17

passed #6551062
kvm
meson-ppc64el

00:03:10

passed #6551061
kvm
meson-s390x

00:03:58

passed #6551059
scons-win64

00:05:06

 
  Software Renderer
passed #6551064
llvmpipe-piglit-cl

00:02:16