selftests/net/pmtu.sh: Fix typo in error message

The word 'expected' was spelled as 'exepcted'.
Fixed the typo in this patch.
Signed-off-by: Abhash Jha <abhashkumarjha123@gmail.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20240814173121.33590-1-abhashkumarjha123@gmail.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/net/pmtu.sh

@@ -1447,7 +1447,7 @@ test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception() {
 		size=$(du -sb $tmpoutfile)
 		size=${size%%/tmp/*}
 
-		[ $size -ne 1048576 ] && err "File size $size mismatches exepcted value in locally bridged vxlan test" && return 1
+		[ $size -ne 1048576 ] && err "File size $size mismatches expected value in locally bridged vxlan test" && return 1
 	done
 
 	rm -f "$tmpoutfile"