GPU: fix code smell

Author: CarterLi

src/detection/gpu/gpu_bsd.c

@@ -13,6 +13,9 @@
 const char* ffDetectGPUImpl(const FFGPUOptions* options, FFlist* gpus)
 {
     FF_AUTO_CLOSE_FD int fd = open("/dev/pci", O_RDONLY, 0);
+    if (fd < 0)
+        return "open(\"/dev/pci\", O_RDONLY, 0) failed";
+
     struct pci_conf confs[128];
     struct pci_match_conf match = {
         .pc_class = PCIC_DISPLAY,
@@ -78,7 +81,7 @@ const char* ffDetectGPUImpl(const FFGPUOptions* options, FFlist* gpus)
             if (gpu->vendor.chars == FF_GPU_VENDOR_NAME_AMD)
                 ffGPUQueryAmdGpuName(pc->pc_device, pc->pc_revid, gpu);
             if (gpu->name.length == 0)
-            ffGPUFillVendorAndName(pc->pc_subclass, pc->pc_vendor, pc->pc_device, gpu);
+                ffGPUFillVendorAndName(pc->pc_subclass, pc->pc_vendor, pc->pc_device, gpu);
         }
 
         if (gpu->type == FF_GPU_TYPE_UNKNOWN)

src/detection/gpu/gpu_linux.c

@@ -426,7 +426,9 @@ static const char* detectPci(const FFGPUOptions* options, FFlist* gpus, FFstrbuf
     }
     else
     {
-        pPciPath = memrchr(deviceDir->chars, '/', deviceDir->length) + 1;
+        pPciPath = memrchr(deviceDir->chars, '/', deviceDir->length);
+        assert(pPciPath);
+        pPciPath++;
     }
 
     uint32_t pciDomain, pciBus, pciDevice, pciFunc;

src/detection/gpu/gpu_sunos.c

@@ -35,8 +35,14 @@ const char* ffDetectGPUImpl(FF_MAYBE_UNUSED const FFGPUOptions* options, FFlist*
     {
         // find the start of device entry
         const char* pstart = memrchr(buffer.chars, '\n', (size_t) (pclass - buffer.chars));
+        if (pstart == NULL)
+            return "PCI info not found, invalid scanpci result";
         while (pstart[1] != 'p')
+        {
             pstart = memrchr(buffer.chars, '\n', (size_t) (pstart - buffer.chars - 1));
+            if (pstart == NULL)
+                return "PCI info not found, invalid scanpci result";
+        }
         ++pstart;
 
         uint32_t vendorId, deviceId;