chipset_enable.c: check return value from rphysmap() call

Port from the ChromiumOS fork of flashrom.

Change-Id: I8075fe5f80ac0da5280d2f0de6829ed3a2496476
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/46444
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sam McNally <sammc@google.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/67852
Reviewed-by: Felix Singer <felixsinger@posteo.net>
---
M chipset_enable.c
1 file changed, 20 insertions(+), 0 deletions(-)

diff --git a/chipset_enable.c b/chipset_enable.c
index 6280876..6f75d66 100644
--- a/chipset_enable.c
+++ b/chipset_enable.c
@@ -930,6 +930,8 @@
 	uint32_t sbase = pci_read_long(dev, 0x54) & 0xfffffe00;
 	msg_pdbg("SPI_BASE_ADDRESS = 0x%x\n", sbase);
 	void *spibar = rphysmap("BYT SBASE", sbase, 512); /* Last defined address on Bay Trail is 0x100 */
+	if (spibar == ERROR_PTR)
+		return ERROR_FATAL;
 
 	/* Enable Flash Writes.
 	 * Silvermont-based: BCR at SBASE + 0xFC (some bits of BCR are also accessible via BC at IBASE + 0x1C).

