Call RADEONFreeRec from RADEONFreeScreen_KMS even if info == NULL

It's safe now.

(Ported from amdgpu commit c9bd1399a13cea2e1331af2c826ca054b88db071)
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

src/radeon_kms.c

@@ -2206,14 +2206,9 @@ static Bool RADEONCloseScreen_KMS(ScreenPtr pScreen)
 
 void RADEONFreeScreen_KMS(ScrnInfoPtr pScrn)
 {
-    RADEONInfoPtr  info  = RADEONPTR(pScrn);
-
     xf86DrvMsgVerb(pScrn->scrnIndex, X_INFO, RADEON_LOGLEVEL_DEBUG,
 		   "RADEONFreeScreen\n");
 
-    /* when server quits at PreInit, we don't need do this anymore*/
-    if (!info) return;
-
     RADEONFreeRec(pScrn);
 }