vnc: Fix packed boolean struct members

This patch fixes warnings reported by splint:

For variables which are packed in a single bit, a signed data type
like 'int' does not make much sense.

There is no obvious reason why the two values should be packed,
so I removed the packing and changed the data type to bool
because both are used as boolean values.

v2:

Some versions of gcc complain after this modification,
for example gcc (Debian 4.4.5-8) 4.4.5):

ui/vnc-auth-sasl.c: In function ‘vnc_sasl_client_cleanup’:
ui/vnc-auth-sasl.c:34: error: suggest parentheses around assignment used as truth value

Obviously, the compiler does not like code which does
bool = unsigned = bool = 0

Splitting that code in three statements works.

Cc: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

ui/vnc-auth-sasl.c

@@ -31,7 +31,9 @@
 void vnc_sasl_client_cleanup(VncState *vs)
 {
     if (vs->sasl.conn) {
-        vs->sasl.runSSF = vs->sasl.waitWriteSSF = vs->sasl.wantSSF = 0;
+        vs->sasl.runSSF = false;
+        vs->sasl.wantSSF = false;
+        vs->sasl.waitWriteSSF = 0;
         vs->sasl.encodedLength = vs->sasl.encodedOffset = 0;
         vs->sasl.encoded = NULL;
         g_free(vs->sasl.username);

ui/vnc-auth-sasl.h

@@ -37,9 +37,9 @@ typedef struct VncDisplaySASL VncDisplaySASL;
 struct VncStateSASL {
     sasl_conn_t *conn;
     /* If we want to negotiate an SSF layer with client */
-    int wantSSF :1;
+    bool wantSSF;
     /* If we are now running the SSF layer */
-    int runSSF :1;
+    bool runSSF;
     /*
      * If this is non-zero, then wait for that many bytes
      * to be written plain, before switching to SSF encoding