Change in coreboot[master]: soc/intel/{common, apollolake}: fix coverity issues

[Rizwan Qureshi (Code Review)]

Rizwan Qureshi has uploaded this change for review. ( https://review.coreboot.org/21875

Change subject: soc/intel/{common,apollolake}: fix coverity issues
......................................................................

soc/intel/{common,apollolake}: fix coverity issues

fix issues reported by coverity scan in the below files

src/soc/intel/common/block/i2c
    1375440: Improper use of negative value
    1375441: Improper use of negative value
    1375444: Improper use of negative value

src/soc/intel/apollolake/i2c.c
    1375442: Unsigned compared against 0

Change-Id: Ic65400c934631e3dcd3aa664c24cb451616e7f4d
Signed-off-by: Rizwan Qureshi 
---
M src/soc/intel/apollolake/i2c.c
M src/soc/intel/common/block/i2c/i2c.c
2 files changed, 8 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/75/21875/1

diff --git a/src/soc/intel/apollolake/i2c.c b/src/soc/intel/apollolake/i2c.c
index 2b6cbf9..4ae500e 100644
--- a/src/soc/intel/apollolake/i2c.c
+++ b/src/soc/intel/apollolake/i2c.c
@@ -44,7 +44,7 @@
 /* Convert I2C bus number to PCI device and function */
 int i2c_soc_bus_to_devfn(unsigned int bus)
 {
-	if (bus >= 0 && bus <= 3)
+	if (bus <= 3)
    	return PCI_DEVFN(PCH_DEV_SLOT_SIO1, bus);
    else if (bus >= 4 && bus <= 7)
    	return PCI_DEVFN(PCH_DEV_SLOT_SIO2, (bus - 4));
diff --git a/src/soc/intel/common/block/i2c/i2c.c b/src/soc/intel/common/block/i2c/i2c.c
index 625bb99..c6f3be2 100644
--- a/src/soc/intel/common/block/i2c/i2c.c
+++ b/src/soc/intel/common/block/i2c/i2c.c
@@ -96,9 +96,12 @@
    const struct lpss_i2c_bus_config *config;
    int bus = lpss_i2c_dev_to_bus(dev);

+	if (bus < 0)
+		return;
+
    config = i2c_get_soc_cfg(bus, dev);

-	if (!config || bus < 0)
+	if (!config)
    	return;

lpss_i2c_init(bus, config);
@@ -126,6 +129,9 @@

bus = lpss_i2c_dev_to_bus(dev);

+	if (bus < 0)
+		return;
+
    bcfg = i2c_get_soc_cfg(bus, dev);

if (!bcfg)