qapi: Replace qobject_to_X(o) by qobject_to(X, o)

This patch was generated using the following Coccinelle script:

@@
expression Obj;
@@
(
- qobject_to_qnum(Obj)
+ qobject_to(QNum, Obj)
|
- qobject_to_qstring(Obj)
+ qobject_to(QString, Obj)
|
- qobject_to_qdict(Obj)
+ qobject_to(QDict, Obj)
|
- qobject_to_qlist(Obj)
+ qobject_to(QList, Obj)
|
- qobject_to_qbool(Obj)
+ qobject_to(QBool, Obj)
)

and a bit of manual fix-up for overly long lines and three places in
tests/check-qjson.c that Coccinelle did not find.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Message-Id: <20180224154033.29559-4-mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
[eblake: swap order from qobject_to(o, X), rebase to master, also a fix
to latent false-positive compiler complaint about hw/i386/acpi-build.c]
Signed-off-by: Eric Blake <eblake@redhat.com>

blockdev.c

@@ -334,7 +334,8 @@ static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
 
         case QTYPE_QSTRING: {
             unsigned long long length;
-            const char *str = qstring_get_str(qobject_to_qstring(entry->value));
+            const char *str = qstring_get_str(qobject_to(QString,
+                                                         entry->value));
             if (parse_uint_full(str, &length, 10) == 0 &&
                 length > 0 && length <= UINT_MAX) {
                 block_acct_add_interval(stats, (unsigned) length);
@@ -346,7 +347,7 @@ static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
         }
 
         case QTYPE_QNUM: {
-            int64_t length = qnum_get_int(qobject_to_qnum(entry->value));
+            int64_t length = qnum_get_int(qobject_to(QNum, entry->value));
 
             if (length > 0 && length <= UINT_MAX) {
                 block_acct_add_interval(stats, (unsigned) length);
@@ -4054,7 +4055,7 @@ void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
     }
 
     visit_complete(v, &obj);
-    qdict = qobject_to_qdict(obj);
+    qdict = qobject_to(QDict, obj);
 
     qdict_flatten(qdict);