Revert "xf86drm: cap number of reported devices by drmGetDevice(2)"

This reverts commit 8cb12a2528.

The commit fixed the OOB, yet it broke drmDevices2(0, NULL, 0) - aka we
did not return the total devices list.

Reviewed-by: Simon Ser <contact@emersion.fr>

xf86drm.c

@@ -4263,13 +4263,12 @@ drm_public int drmGetDevices2(uint32_t flags, drmDevicePtr devices[],
         if (!local_devices[i])
             continue;
 
-        if ((devices != NULL) && (device_count < max_devices)) {
+        if ((devices != NULL) && (device_count < max_devices))
             devices[device_count] = local_devices[i];
-            device_count++;
-        } else {
+        else
             drmFreeDevice(&local_devices[i]);
-        }
 
+        device_count++;
     }
 
     closedir(sysdir);