ati_radeon: return with error when emulator fails

Console was being switched to video even if emulator fails and
causing this hang:

               Scanning PCI bus 04
        04  00  1095  3132  0104  00
    PCIE3 on bus 03 - 04
Video: ATI Radeon video card (1002, 5b60) found @(2:0:0)
videoboot: Booting PCI video card bus 2, function 0, device 0
videoboot: Video ROM failed to map!
640x480x8 31kHz 59Hz
radeonfb: FIFO Timeout !

Signed-off-by: Ed Swarthout <Ed.Swarthout@freescale.com>
Tested-by: Anatolij Gustschin <agust@denx.de>

drivers/bios_emulator/atibios.c

@@ -315,7 +315,8 @@ int BootVideoCardBIOS(pci_dev_t pcidev, BE_VGAInfo ** pVGAInfo, int cleanUp)
 	BE_init(0, 65536, VGAInfo, 0);
 
 	/*Post all the display controller BIOS'es*/
-	PCI_postController(pcidev, VGAInfo);
+	if (!PCI_postController(pcidev, VGAInfo))
+		return false;
 
 	/*Cleanup and exit the emulator if requested. If the BIOS emulator
 	is needed after booting the card, we will not call BE_exit and

drivers/video/ati_radeon_fb.c

@@ -597,7 +597,8 @@ int radeon_probe(struct radeonfb_info *rinfo)
 		rinfo->fb_local_base = INREG(MC_FB_LOCATION) << 16;
 		DPRINT("rinfo->fb_local_base = 0x%x\n",rinfo->fb_local_base);
 		/* PostBIOS with x86 emulater */
-		BootVideoCardBIOS(pdev, NULL, 0);
+		if (!BootVideoCardBIOS(pdev, NULL, 0))
+			return -1;
 
 		/*
 		 * Check for errata