kdrive: don't let evdev driver overwrite existing device names

KDrive evdev driver deliberately name grabbed devices as "Evdev mouse"
or "Evdev keyboard". This patch will make it skip this step if grabbed
devices are already named (i.e. from udev).
Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Laércio de Sousa <laerciosousa@sme-mogidascruzes.sp.gov.br>

hw/kdrive/linux/evdev.c

@@ -220,7 +220,8 @@ EvdevPtrInit(KdPointerInfo * pi)
 
     close(fd);
 
-    pi->name = strdup("Evdev mouse");
+    if (!pi->name)
+        pi->name = strdup("Evdev mouse");
 
     return Success;
 }
@@ -390,7 +391,8 @@ EvdevKbdInit(KdKeyboardInfo * ki)
 
     close(fd);
 
-    ki->name = strdup("Evdev keyboard");
+    if (!ki->name)
+        ki->name = strdup("Evdev keyboard");
 
     readMapping(ki);