Revert "inet: prevent leakage of uninitialized memory to user in recv syscalls"

Will apply the actual patch.

This reverts commit 11afb94fbe0337a06ee7fce36841969b4e538622.

Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>

Conflicts:
	net/ipv4/ping.c