staging: rtl8712: fix long-line checkpatch warning

staging: rtl8712: fix long-line checkpatch warning

This patch fixes the following warning in rtl871x_xmit.c:

WARNING: line over 80 characters
130: FILE: drivers/staging//rtl8712/rtl871x_xmit.c:130:
+		pxmitbuf->pallocated_buf = kmalloc(MAX_XMITBUF_SZ + XMITBUF_ALIGN_SZ,

Signed-off-by: Aiman Najjar <aiman.najjar@hurranet.com>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/de477e0d8f352c1d6cd75d64d84ac6f9017db254.1585508171.git.aiman.najjar@hurranet.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>