staging: kpc2000: removed superfluous NULL checks from device attribute call-backs.

All the attribute show call-backs check whether pcard is NULL.  However,
pci_set_drvdata(pdev, pcard) is called before the sysfs files are
created during probe, and pci_set_drvdata(pdev, NULL) is not called
until after they are destroyed during remove; therefore, pcard will not
be NULL, and we can drop the checks.
Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/kpc2000/kpc2000/core.c

@@ -37,9 +37,6 @@ static ssize_t ssid_show(struct device *dev, struct device_attribute *attr,
 {
 	struct kp2000_device *pcard = dev_get_drvdata(dev);
 
-	if (!pcard)
-		return -ENXIO;
-
 	return sprintf(buf, "%016llx\n", pcard->ssid);
 }
 static DEVICE_ATTR_RO(ssid);
@@ -49,9 +46,6 @@ static ssize_t ddna_show(struct device *dev, struct device_attribute *attr,
 {
 	struct kp2000_device *pcard = dev_get_drvdata(dev);
 
-	if (!pcard)
-		return -ENXIO;
-
 	return sprintf(buf, "%016llx\n", pcard->ddna);
 }
 static DEVICE_ATTR_RO(ddna);
@@ -61,9 +55,6 @@ static ssize_t card_id_show(struct device *dev, struct device_attribute *attr,
 {
 	struct kp2000_device *pcard = dev_get_drvdata(dev);
 
-	if (!pcard)
-		return -ENXIO;
-
 	return sprintf(buf, "%08x\n", pcard->card_id);
 }
 static DEVICE_ATTR_RO(card_id);
@@ -73,9 +64,6 @@ static ssize_t hw_rev_show(struct device *dev, struct device_attribute *attr,
 {
 	struct kp2000_device *pcard = dev_get_drvdata(dev);
 
-	if (!pcard)
-		return -ENXIO;
-
 	return sprintf(buf, "%08x\n", pcard->hardware_revision);
 }
 static DEVICE_ATTR_RO(hw_rev);
@@ -85,9 +73,6 @@ static ssize_t build_show(struct device *dev, struct device_attribute *attr,
 {
 	struct kp2000_device *pcard = dev_get_drvdata(dev);
 
-	if (!pcard)
-		return -ENXIO;
-
 	return sprintf(buf, "%08x\n", pcard->build_version);
 }
 static DEVICE_ATTR_RO(build);
@@ -97,9 +82,6 @@ static ssize_t build_date_show(struct device *dev,
 {
 	struct kp2000_device *pcard = dev_get_drvdata(dev);
 
-	if (!pcard)
-		return -ENXIO;
-
 	return sprintf(buf, "%08x\n", pcard->build_datestamp);
 }
 static DEVICE_ATTR_RO(build_date);
@@ -109,9 +91,6 @@ static ssize_t build_time_show(struct device *dev,
 {
 	struct kp2000_device *pcard = dev_get_drvdata(dev);
 
-	if (!pcard)
-		return -ENXIO;
-
 	return sprintf(buf, "%08x\n", pcard->build_timestamp);
 }
 static DEVICE_ATTR_RO(build_time);
@@ -122,9 +101,6 @@ static ssize_t cpld_reg_show(struct device *dev, struct device_attribute *attr,
 	struct kp2000_device *pcard = dev_get_drvdata(dev);
 	u64 val;
 
-	if (!pcard)
-		return -ENXIO;
-
 	val = readq(pcard->sysinfo_regs_base + REG_CPLD_CONFIG);
 	return sprintf(buf, "%016llx\n", val);
 }
@@ -138,9 +114,6 @@ static ssize_t cpld_reconfigure(struct device *dev,
 	long wr_val;
 	int rv;
 
-	if (!pcard)
-		return -ENXIO;
-
 	rv = kstrtol(buf, 0, &wr_val);
 	if (rv < 0)
 		return rv;