[PATCH] acpi: cstates: fix clang build warning on zero CPUs.

[Colin King]

From: Colin Ian King <colin.king at canonical.com>

A small corner case were zero CPUs are available in
/sys/devices/system/cpu can cause a division by zero when
computing the tests progress.  Bail out early and don't test
any CPUs rather if the number of CPUs is zero.  This can
potentially occur if the /sys entries are not mounted.

Signed-off-by: Colin Ian King <colin.king at canonical.com>
---
 src/acpi/cstates/cstates.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/acpi/cstates/cstates.c b/src/acpi/cstates/cstates.c
index 4bced4d..5e15732 100644
--- a/src/acpi/cstates/cstates.c
+++ b/src/acpi/cstates/cstates.c
@@ -217,7 +217,7 @@ static int cstates_test1(fwts_framework *fw)
 	}
 
 	/* How many CPUs are there? */
-	for (cpus=0;(entry = readdir(dir)) != NULL;)
+	for (cpus = 0; (entry = readdir(dir)) != NULL;)
 		if (entry &&
 		    (strlen(entry->d_name)>3) &&
 		    (strncmp(entry->d_name, "cpu", 3) == 0) &&
@@ -226,7 +226,7 @@ static int cstates_test1(fwts_framework *fw)
 
 	rewinddir(dir);
 
-	for (i=0;(entry = readdir(dir)) != NULL;) {
+	for (i = 0; (cpus > 0) && (entry = readdir(dir)) != NULL;) {
 		if (entry &&
 		    (strlen(entry->d_name)>3) &&
 		    (strncmp(entry->d_name, "cpu", 3) == 0) &&
-- 
2.6.4