[PATCH 3/3] Avoid Wunsed-but-set warnings (or errors in case of Werror)

[Raghavendra D Prabhu <raghu.prabhu13@gmail.com>]

In a few cases, variable attributed 'unused' has been added, in other cases
unused variable has been either removed or commented out.

Signed-off-by: Raghavendra D Prabhu <rprabhu@wnohang.net>
---
 hw/device-assignment.c |    6 +++---
 simpletrace.c          |    2 +-
 xen-mapcache.c         |    7 ++-----
 3 files changed, 6 insertions(+), 9 deletions(-)

diff --git a/hw/device-assignment.c b/hw/device-assignment.c
index 36ad6b0..19a59b4 100644
--- a/hw/device-assignment.c
+++ b/hw/device-assignment.c
@@ -1654,7 +1654,7 @@ static void reset_assigned_device(DeviceState *dev)
     AssignedDevice *adev = DO_UPCAST(AssignedDevice, dev, pci_dev);
     char reset_file[64];
     const char reset[] = "1";
-    int fd, ret;
+    int fd, __attribute__((unused)) ret;
 
     snprintf(reset_file, sizeof(reset_file),
              "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/reset",
@@ -1682,7 +1682,7 @@ static void reset_assigned_device(DeviceState *dev)
 static int assigned_initfn(struct PCIDevice *pci_dev)
 {
     AssignedDevice *dev = DO_UPCAST(AssignedDevice, dev, pci_dev);
-    uint8_t e_device, e_intx;
+    uint8_t e_intx;
     int r;
 
     if (!kvm_enabled()) {
@@ -1709,7 +1709,7 @@ static int assigned_initfn(struct PCIDevice *pci_dev)
         goto out;
 
     /* handle interrupt routing */
-    e_device = (dev->dev.devfn >> 3) & 0x1f;
+    /*e_device = (dev->dev.devfn >> 3) & 0x1f;*/
     e_intx = dev->dev.config[0x3d] - 1;
     dev->intpin = e_intx;
     dev->run = 0;
diff --git a/simpletrace.c b/simpletrace.c
index f1dbb5e..2ce9cff 100644
--- a/simpletrace.c
+++ b/simpletrace.c
@@ -119,7 +119,7 @@ static void *writeout_thread(void *opaque)
     TraceRecord record;
     unsigned int writeout_idx = 0;
     unsigned int num_available, idx;
-    size_t unused;
+    size_t __attribute__((unused)) unused;
 
     for (;;) {
         wait_for_trace_records_available();
diff --git a/xen-mapcache.c b/xen-mapcache.c
index fac47cd..94642bc 100644
--- a/xen-mapcache.c
+++ b/xen-mapcache.c
@@ -166,7 +166,7 @@ static void qemu_remap_bucket(MapCacheEntry *entry,
 
 uint8_t *qemu_map_cache(target_phys_addr_t phys_addr, target_phys_addr_t size, uint8_t lock)
 {
-    MapCacheEntry *entry, *pentry = NULL;
+    MapCacheEntry *entry;
     target_phys_addr_t address_index  = phys_addr >> MCACHE_BUCKET_SHIFT;
     target_phys_addr_t address_offset = phys_addr & (MCACHE_BUCKET_SIZE - 1);
     target_phys_addr_t __size = size;
@@ -192,12 +192,10 @@ uint8_t *qemu_map_cache(target_phys_addr_t phys_addr, target_phys_addr_t size, u
             (entry->paddr_index != address_index || entry->size != __size ||
              !test_bits(address_offset >> XC_PAGE_SHIFT, size >> XC_PAGE_SHIFT,
                  entry->valid_mapping))) {
-        pentry = entry;
         entry = entry->next;
     }
     if (!entry) {
         entry = qemu_mallocz(sizeof (MapCacheEntry));
-        pentry->next = entry;
         qemu_remap_bucket(entry, __size, address_index);
     } else if (!entry->lock) {
         if (!entry->vaddr_base || entry->paddr_index != address_index ||
@@ -232,7 +230,7 @@ uint8_t *qemu_map_cache(target_phys_addr_t phys_addr, target_phys_addr_t size, u
 
 ram_addr_t qemu_ram_addr_from_mapcache(void *ptr)
 {
-    MapCacheEntry *entry = NULL, *pentry = NULL;
+    MapCacheEntry *entry = NULL;
     MapCacheRev *reventry;
     target_phys_addr_t paddr_index;
     target_phys_addr_t size;
@@ -258,7 +256,6 @@ ram_addr_t qemu_ram_addr_from_mapcache(void *ptr)
 
     entry = &mapcache->entry[paddr_index % mapcache->nr_buckets];
     while (entry && (entry->paddr_index != paddr_index || entry->size != size)) {
-        pentry = entry;
         entry = entry->next;
     }
     if (!entry) {
-- 
1.7.6