[coreboot-gerrit] Change in coreboot[master]: device: Prevent using `mmconf_resource` with invalid values

[Angel Pons (Code Review)]

Attention is currently required from: Nico Huber, Tim Wawrzynczak, Arthur Heymans, Evgeny Zinoviev, Kyösti Mälkki, Patrick Rudolph, Felix Held.
Angel Pons has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/49744 )

Change subject: device: Prevent using `mmconf_resource` with invalid values
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Patch Set 3:

(1 comment)

File src/device/device_util.c:

https://review.coreboot.org/c/coreboot/+/49744/comment/c042674d_ff5c2042 
PS2, Line 881: CONFIG_MMCONF_BASE_ADDRESS <= 0
> You can still attempt to call mmconf_resource() with !MMCONF_SUPPORT, so this check isn't redundant. […]

Looks like I forgot to change the comparison. Done