Tweak a few "Parameter 'NAME' expects THING" error message

Change to "expects a THING" where that's an obvious improvement

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20201113082626.2725812-11-armbru@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/blockdev.c b/blockdev.c
index d05a874..6c7be7c 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2991,7 +2991,7 @@ static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs,
     }
     if (granularity & (granularity - 1)) {
         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
-                   "power of 2");
+                   "a power of 2");
         return;
     }