KVM: TDX: Fix uninitialized error code for __tdx_bringup()

Fix a Smatch static checker warning reported by Dan:

	arch/x86/kvm/vmx/tdx.c:3464 __tdx_bringup()
	warn: missing error code 'r'

Initialize r to -EINVAL before tdx_get_sysinfo() to simplify the code and
to prevent similar issues from sneaking in later on as suggested by Kai.

Cc: stable@vger.kernel.org
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Fixes: 61bb282 ("KVM: TDX: Get system-wide info about TDX module on initialization")
Suggested-by: Kai Huang <kai.huang@intel.com>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Signed-off-by: Tony Lindgren <tony.lindgren@linux.intel.com>
Link: https://lore.kernel.org/r/20250918053226.802204-1-tony.lindgren@linux.intel.com
[sean: tag for stable]
Signed-off-by: Sean Christopherson <seanjc@google.com>

Author: tony-lindgren

arch/x86/kvm/vmx/tdx.c

@@ -3457,12 +3457,11 @@ static int __init __tdx_bringup(void)
 	if (r)
 		goto tdx_bringup_err;
 
+	r = -EINVAL;
 	/* Get TDX global information for later use */
 	tdx_sysinfo = tdx_get_sysinfo();
-	if (WARN_ON_ONCE(!tdx_sysinfo)) {
-		r = -EINVAL;
+	if (WARN_ON_ONCE(!tdx_sysinfo))
 		goto get_sysinfo_err;
-	}
 
 	/* Check TDX module and KVM capabilities */
 	if (!tdx_get_supported_attrs(&tdx_sysinfo->td_conf) ||
@@ -3505,14 +3504,11 @@ static int __init __tdx_bringup(void)
 	if (td_conf->max_vcpus_per_td < num_present_cpus()) {
 		pr_err("Disable TDX: MAX_VCPU_PER_TD (%u) smaller than number of logical CPUs (%u).\n",
 				td_conf->max_vcpus_per_td, num_present_cpus());
-		r = -EINVAL;
 		goto get_sysinfo_err;
 	}
 
-	if (misc_cg_set_capacity(MISC_CG_RES_TDX, tdx_get_nr_guest_keyids())) {
-		r = -EINVAL;
+	if (misc_cg_set_capacity(MISC_CG_RES_TDX, tdx_get_nr_guest_keyids()))
 		goto get_sysinfo_err;
-	}
 
 	/*
 	 * Leave hardware virtualization enabled after TDX is enabled