dmi: Correctly check for ERROR_PTR

For the physmap*() functions, NULL is considered valid return value.
Fixes a segmentation fault when DMI tables can't be mapped.

Tested on intel/eblake board with broken coreboot.

Change-Id: Ic403c2940c2b91acbd113f0acfa3ce9ef6c6bb6c
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/62616
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/dmi.c b/dmi.c
index 729cdb119..2d17294b1 100644
--- a/dmi.c
+++ b/dmi.c
@@ -169,7 +169,7 @@ static void dmi_table(uint32_t base, uint16_t len, uint16_t num)
 	int i = 0, j = 0;
 
 	uint8_t *dmi_table_mem = physmap_ro("DMI Table", base, len);
-	if (dmi_table_mem == NULL) {
+	if (dmi_table_mem == ERROR_PTR) {
 		msg_perr("Unable to access DMI Table\n");
 		return;
 	}