Staging: rtl8192e: Cleaning up error handling

Moved error handling to one common block.
This removes double checking if all txb->fragments[]
were initialized.
The original code worked fine, but this is cleaner.

Signed-off-by: Felix Schlepper <f3sch.git@outlook.com>
Link: https://lore.kernel.org/r/13b32131cd00a1f0b8793657a24ada71240a8350.1656078068.git.f3sch.git@outlook.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>