pkt-line: fix a typo

This typo was introduced in 2153d478b74 (pkt-line: introduce
packet_read_with_status, 2018-03-14).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/pkt-line.h b/pkt-line.h
index 5c62015..fef3a0d 100644
--- a/pkt-line.h
+++ b/pkt-line.h
@@ -77,7 +77,7 @@
 /*
  * Read a packetized line into a buffer like the 'packet_read()' function but
  * returns an 'enum packet_read_status' which indicates the status of the read.
- * The number of bytes read will be assigined to *pktlen if the status of the
+ * The number of bytes read will be assigned to *pktlen if the status of the
  * read was 'PACKET_READ_NORMAL'.
  */
 enum packet_read_status {