qed: fix possible uninit pointer read in qed_mcp_nvm_info_populate()

Coverity reports an uninit pointer read in qed_mcp_nvm_info_populate().
If EOPNOTSUPP is returned from qed_mcp_bist_nvm_get_num_images() ensure
nvm_info.num_images is set to 0 to avoid possible uninit assignment
to p_hwfn->nvm_info.image_att later on in out label.

Closes: https://scan5.scan.coverity.com/#/project-view/63204/10063?selectedIssue=1636666
Suggested-by: Simon Horman <[email protected]>
Signed-off-by: Gianfranco Trad <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Paolo Abeni <[email protected]>

Author: t-gian

drivers/net/ethernet/qlogic/qed/qed_mcp.c

@@ -3358,6 +3358,7 @@ int qed_mcp_nvm_info_populate(struct qed_hwfn *p_hwfn)
 					     p_ptt, &nvm_info.num_images);
 	if (rc == -EOPNOTSUPP) {
 		DP_INFO(p_hwfn, "DRV_MSG_CODE_BIST_TEST is not supported\n");
+		nvm_info.num_images = 0;
 		goto out;
 	} else if (rc || !nvm_info.num_images) {
 		DP_ERR(p_hwfn, "Failed getting number of images\n");