SWDEV-518826: Adding nullptr check after gpu name query (#257)

* Fix segfault on fail to query GPU name

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Co-authored-by: Giovanni Baraldi <gbaraldi@amd.com>

source/lib/rocprofiler-sdk/agent.cpp

@@ -708,9 +708,12 @@ read_topology()
                     agent_info.name =
                         common::get_string_entry(fmt::format("gfx{}{}{:x}", major, minor, step))
                             ->c_str();
-                    agent_info.product_name =
-                        common::get_string_entry(amdgpu_get_marketing_name(device_handle))->c_str();
-                    agent_info.vendor_name = common::get_string_entry("AMD")->c_str();
+
+                    const char* marketing_name = amdgpu_get_marketing_name(device_handle);
+                    if(marketing_name == nullptr) marketing_name = "unknown";
+
+                    agent_info.product_name = common::get_string_entry(marketing_name)->c_str();
+                    agent_info.vendor_name  = common::get_string_entry("AMD")->c_str();
 
                     amdgpu_gpu_info gpu_info = {};
                     if(amdgpu_query_gpu_info(device_handle, &gpu_info) == 0)