(bsd)patch vs ports

[Andriy Gapon]

When building ports on head I sometimes see messages like the following during a
patch phase:

===>  Applying FreeBSD patches for firefox-25.0_1,1
No such line 262 in input file, ignoring
===>  Applying NSS patches
No such line 194 in input file, ignoring
No such line 658 in input file, ignoring
No such line 52 in input file, ignoring
No such line 45 in input file, ignoring

Is this a cause for concern?
Do those messages mean that potentially important patches are not actually applied?

-- 
Andriy Gapon