Drivers: hv: vmbus: Remove duplication and cleanup code in create_gpadl_header()

Drivers: hv: vmbus: Remove duplication and cleanup code in create_gpadl_header()

create_gpadl_header() creates a message header, and one or more message
bodies if the number of GPADL entries exceeds what fits in the
header. Currently the code for creating the message header is
duplicated in the two halves of the main "if" statement governing
whether message bodies are created.

Eliminate the duplication by making minor tweaks to the logic and
associated comments. While here, simplify the handling of memory
allocation errors, and use umin() instead of open coding it.

For ease of review, the indentation of sizable chunks of code is
*not* changed.  A follow-on patch updates only the indentation.

No functional change.

Suggested-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Michael Kelley <mhklinux@outlook.com>
Link: https://lore.kernel.org/r/20240111165451.269418-1-mhklinux@outlook.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Message-ID: <20240111165451.269418-1-mhklinux@outlook.com>