error: Eliminate error_propagate() with Coccinelle, part 2

When all we do with an Error we receive into a local variable is
propagating to somewhere else, we can just as well receive it there
right away.  The previous commit did that with a Coccinelle script I
consider fairly trustworthy.  This commit uses the same script with
the matching of return taken out, i.e. we convert

    if (!foo(..., &err)) {
        ...
        error_propagate(errp, err);
        ...
    }

to

    if (!foo(..., errp)) {
        ...
        ...
    }

This is unsound: @err could still be read between afterwards.  I don't
know how to express "no read of @err without an intervening write" in
Coccinelle.  Instead, I manually double-checked for uses of @err.

Suboptimal line breaks tweaked manually.  qdev_realize() simplified
further to placate scripts/checkpatch.pl.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200707160613.848843-36-armbru@redhat.com>

1 files changed, 1 insertions, 3 deletions

diff --git a/block/vmdk.c b/block/vmdk.c
index 4d42d2f..9a09193 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -2250,7 +2250,6 @@ static int vmdk_create_extent(const char *filename, int64_t filesize,
 {
     int ret;
     BlockBackend *blk = NULL;
-    Error *local_err = NULL;
 
     ret = bdrv_create_file(filename, opts, errp);
     if (ret < 0) {
@@ -2259,9 +2258,8 @@ static int vmdk_create_extent(const char *filename, int64_t filesize,
 
     blk = blk_new_open(filename, NULL, NULL,
                        BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL,
-                       &local_err);
+                       errp);
     if (blk == NULL) {
-        error_propagate(errp, local_err);
         ret = -EIO;
         goto exit;
     }