e1000e: Fix build with gcc 4.6.3 and ust tracing

This patch fixes used-uninitialized false
positive while compiling with ust tracing
backend plus gcc 4.6.3:

hw/net/e1000e.c: In function ‘e1000e_io_write’:
hw/net/e1000e.c:170:39: error: ‘idx’ may be used uninitialized in this function [-Werror=uninitialized]
hw/net/e1000e.c: In function ‘e1000e_io_read’:
hw/net/e1000e.c:145:35: error: ‘idx’ may be used uninitialized in this function [-Werror=uninitialized]
cc1: all warnings being treated as errors
make: *** [hw/net/e1000e.o] Error 1

Signed-off-by: Dmitry Fleytman <dmitry@daynix.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-id: 1465023763-10773-1-git-send-email-dmitry@daynix.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/net/e1000e.c

@@ -133,7 +133,7 @@ static uint64_t
 e1000e_io_read(void *opaque, hwaddr addr, unsigned size)
 {
     E1000EState *s = opaque;
-    uint32_t idx;
+    uint32_t idx = 0;
     uint64_t val;
 
     switch (addr) {
@@ -158,7 +158,7 @@ e1000e_io_write(void *opaque, hwaddr addr,
                 uint64_t val, unsigned size)
 {
     E1000EState *s = opaque;
-    uint32_t idx;
+    uint32_t idx = 0;
 
     switch (addr) {
     case E1000_IOADDR: