tcp: Spelling s/curcuit/circuit/

Fix a misspelling of "circuit".

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/ipv4/tcp_input.c

···
  * L|R	1		- orig is lost, retransmit is in flight.
  * S|R  1		- orig reached receiver, retrans is still in flight.
  * (L|S|R is logically valid, it could occur when L|R is sacked,
- *  but it is equivalent to plain S and code short-curcuits it to S.
+ *  but it is equivalent to plain S and code short-circuits it to S.
  *  L|S is logically invalid, it would mean -1 packet in flight 8))
  *
  * These 6 states form finite state machine, controlled by the following events: