qemu-option: Use returned bool to check for failure

The previous commit enables conversion of

    foo(..., &err);
    if (err) {
        ...
    }

to

    if (!foo(..., &err)) {
        ...
    }

for QemuOpts functions that now return true / false on success /
error.  Coccinelle script:

    @@
    identifier fun = {
        opts_do_parse, parse_option_bool, parse_option_number,
        parse_option_size, qemu_opt_parse, qemu_opt_rename, qemu_opt_set,
        qemu_opt_set_bool, qemu_opt_set_number, qemu_opts_absorb_qdict,
        qemu_opts_do_parse, qemu_opts_from_qdict_entry, qemu_opts_set,
        qemu_opts_validate
    };
    expression list args, args2;
    typedef Error;
    Error *err;
    @@
    -    fun(args, &err, args2);
    -    if (err)
    +    if (!fun(args, &err, args2))
         {
             ...
         }

A few line breaks tidied up manually.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20200707160613.848843-15-armbru@redhat.com>
[Conflict with commit 0b6786a9c1 "block/amend: refactor qcow2 amend
options" resolved by rerunning Coccinelle on master's version]

1 files changed, 2 insertions, 4 deletions

diff --git a/chardev/char.c b/chardev/char.c
index df697f3ce9..e5b43cb4b8 100644
--- a/chardev/char.c
+++ b/chardev/char.c
@@ -444,8 +444,7 @@ QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename,
         qemu_opt_set(opts, "host", host, &error_abort);
         qemu_opt_set(opts, "port", port, &error_abort);
         if (p[pos] == ',') {
-            qemu_opts_do_parse(opts, p+pos+1, NULL, &local_err);
-            if (local_err) {
+            if (!qemu_opts_do_parse(opts, p + pos + 1, NULL, &local_err)) {
                 error_report_err(local_err);
                 goto fail;
             }
@@ -484,8 +483,7 @@ QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename,
     }
     if (strstart(filename, "unix:", &p)) {
         qemu_opt_set(opts, "backend", "socket", &error_abort);
-        qemu_opts_do_parse(opts, p, "path", &local_err);
-        if (local_err) {
+        if (!qemu_opts_do_parse(opts, p, "path", &local_err)) {
             error_report_err(local_err);
             goto fail;
         }