hw/nvme: fix -Werror=maybe-uninitialized

../hw/nvme/ctrl.c:6081:21: error: ‘result’ may be used uninitialized [-Werror=maybe-uninitialized]

It's not obvious that 'result' is set in all code paths. When &result is
a returned argument, it's even less clear.

Looking at various assignments, 0 seems to be a suitable default value.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Klaus Jensen <k.jensen@samsung.com>
Message-ID: <20240328102052.3499331-18-marcandre.lureau@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

Author: elmarco

hw/nvme/ctrl.c

@@ -5894,7 +5894,7 @@ static uint16_t nvme_get_feature(NvmeCtrl *n, NvmeRequest *req)
     uint32_t dw10 = le32_to_cpu(cmd->cdw10);
     uint32_t dw11 = le32_to_cpu(cmd->cdw11);
     uint32_t nsid = le32_to_cpu(cmd->nsid);
-    uint32_t result;
+    uint32_t result = 0;
     uint8_t fid = NVME_GETSETFEAT_FID(dw10);
     NvmeGetFeatureSelect sel = NVME_GETFEAT_SELECT(dw10);
     uint16_t iv;