[client/common] fixes for issues detected through static analysis.

common/src/platform/linux/ivshmem.c

@@ -120,7 +120,7 @@ bool ivshmemOpenDev(struct IVSHMEM * dev, const char * shmDevice)
   DEBUG_ASSERT(dev);
 
   unsigned int devSize;
-  int devFd = -1;
+  int devFd;
   bool hasDMA;
 
   dev->opaque = NULL;

common/src/platform/linux/thread.c

@@ -44,6 +44,12 @@ static void * threadWrapper(void * opaque)
 bool lgCreateThread(const char * name, LGThreadFunction function, void * opaque, LGThread ** handle)
 {
   *handle = malloc(sizeof(**handle));
+  if (!*handle)
+  {
+    DEBUG_ERROR("out of memory");
+    return false;
+  }
+
   (*handle)->name     = name;
   (*handle)->function = function;
   (*handle)->opaque   = opaque;