x25: Correct spelling in x25.h

Correct spelling in x25.h
As reported by codespell.
Signed-off-by: Simon Horman <horms@kernel.org>
Reviewed-by: Martin Schiller <ms@dev.tdt.de>
Link: https://patch.msgid.link/20240822-net-spell-v1-11-3a98971ce2d2@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

include/net/x25.h

@@ -81,7 +81,7 @@ enum {
 
 #define	X25_DEFAULT_WINDOW_SIZE	2			/* Default Window Size	*/
 #define	X25_DEFAULT_PACKET_SIZE	X25_PS128		/* Default Packet Size */
-#define	X25_DEFAULT_THROUGHPUT	0x0A			/* Deafult Throughput */
+#define	X25_DEFAULT_THROUGHPUT	0x0A			/* Default Throughput */
 #define	X25_DEFAULT_REVERSE	0x00			/* Default Reverse Charging */
 
 #define X25_SMODULUS 		8