[PATCH for-4.7 5/7] tools/kdd: Fix uninitialised variable warning

[Andrew Cooper <andrew.cooper3@citrix.com>]

Clang warns:

  kdd.c:1031:9: error: variable 'fd' is used uninitialized whenever '||'
  condition is true [-Werror,-Wsometimes-uninitialized]
      if (argc != 4
          ^~~~~~~~~
  kdd.c:1040:20: note: uninitialized use occurs here
      if (select(fd + 1, &fds, NULL, NULL, NULL) > 0)
                 ^~

This situation can't actually happen, as usage() is a terminal path.  Annotate
it appropriately.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
CC: Ian Jackson <Ian.Jackson@eu.citrix.com>
CC: Wei Liu <wei.liu2@citrix.com>
---
 tools/debugger/kdd/kdd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/debugger/kdd/kdd.c b/tools/debugger/kdd/kdd.c
index 9a0225b..70f007e 100644
--- a/tools/debugger/kdd/kdd.c
+++ b/tools/debugger/kdd/kdd.c
@@ -998,7 +998,7 @@ void kdd_select_callback(kdd_state *s)
 }
 
 
-static void usage(void)
+static void __attribute__((noreturn)) usage(void)
 {
     fprintf(stderr, 
 " usage: kdd [-v] <domid> <address> <port>\n"
-- 
2.1.4


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