[PATCH] qemu: silence clang false positives

[Eric Blake <eblake@xxxxxxxxxx>]

Clang 2.8 wasn't quite able to follow that persistentDef was
assigned earlier if (flags & VIR_DOMAIN_MEM_CONFIG) is true.
Silence this false positive, to make clang analysis easier to use.

* src/qemu/qemu_driver.c (qemudDomainSetMemoryFlags): Add an
annotation to silence clang's claim of a NULL dereference.
---

I'm pushing this under the trivial rule - sa_assert is a no-op in
normal compilation, so this can't have any effect on the end
executable, but makes the rest of my clang analysis easier.

 src/qemu/qemu_driver.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 0919503..7132837 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -1640,6 +1640,8 @@ static int qemudDomainSetMemoryFlags(virDomainPtr dom, unsigned long newmem,
         }

         if (flags & VIR_DOMAIN_MEM_CONFIG) {
+            /* Help clang 2.8 decipher the logic flow.  */
+            sa_assert(persistentDef);
             persistentDef->mem.max_balloon = newmem;
             if (persistentDef->mem.cur_balloon > newmem)
                 persistentDef->mem.cur_balloon = newmem;
@@ -1675,6 +1677,7 @@ static int qemudDomainSetMemoryFlags(virDomainPtr dom, unsigned long newmem,
         }

         if (flags & VIR_DOMAIN_MEM_CONFIG) {
+            sa_assert(persistentDef);
             persistentDef->mem.cur_balloon = newmem;
             ret = virDomainSaveConfig(driver->configDir, persistentDef);
             goto endjob;
-- 
1.7.4.4

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