soc/amd/common/espi_util: espi_send_command: improve error message

It's only an error if bits other than ESPI_STATUS_DNCMD_COMPLETE are set
in the status register. If ESPI_STATUS_DNCMD_COMPLETE isn't set, the
command failed, so we expect that one to be set.

Change-Id: I6f1fb5a59b1ecadd6724a07212626f21fb90e7e7
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44352
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/soc/amd/common/block/lpc/espi_util.c

@@ -470,7 +470,8 @@ static int espi_send_command(const struct espi_cmd *cmd)
 	}
 
 	if (status & ~ESPI_STATUS_DNCMD_COMPLETE) {
-		espi_show_failure(cmd, "Error: eSPI status register bits set", status);
+		espi_show_failure(cmd, "Error: unexpected eSPI status register bits set",
+				  status);
 		return -1;
 	}