[PATCH-for-6.0] hw/mem/meson: Fix linking sparse-mem device with fuzzer

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

sparse-mem.c is added to the 'mem_ss' source set, which itself
is conditionally added to softmmu_ss if CONFIG_MEM_DEVICE is
selected.
But if CONFIG_MEM_DEVICE isn't selected, we get a link failure
even if CONFIG_FUZZ is selected:

  /usr/bin/ld: tests_qtest_fuzz_generic_fuzz.c.o: in function `generic_pre_fuzz':
  tests/qtest/fuzz/generic_fuzz.c:826: undefined reference to `sparse_mem_init'
  clang-10: error: linker command failed with exit code 1 (use -v to see invocation)

Fix by adding sparse-mem.c directly to the softmmu_ss set.

Fixes: 230376d285b ("memory: add a sparse memory device for fuzzing")
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 hw/mem/meson.build | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hw/mem/meson.build b/hw/mem/meson.build
index ef79e046787..3c8fdef9f9e 100644
--- a/hw/mem/meson.build
+++ b/hw/mem/meson.build
@@ -1,8 +1,9 @@
 mem_ss = ss.source_set()
 mem_ss.add(files('memory-device.c'))
-mem_ss.add(when: 'CONFIG_FUZZ', if_true: files('sparse-mem.c'))
 mem_ss.add(when: 'CONFIG_DIMM', if_true: files('pc-dimm.c'))
 mem_ss.add(when: 'CONFIG_NPCM7XX', if_true: files('npcm7xx_mc.c'))
 mem_ss.add(when: 'CONFIG_NVDIMM', if_true: files('nvdimm.c'))
 
 softmmu_ss.add_all(when: 'CONFIG_MEM_DEVICE', if_true: mem_ss)
+
+softmmu_ss.add(when: 'CONFIG_FUZZ', if_true: files('sparse-mem.c'))
-- 
2.26.3