ISO warnings?

[Dirk Koopman]

If I use the following compiler:
$ gcc --version
gcc (GCC) 3.3.1 (Mandrake Linux 9.2 3.3.1-2mdk)

with these flags:-
gcc   -std=c99 -pedantic -Wall

for this code:
        char *p;
#line 73
        if (SvTRUE(ERRSV)) {
                STRLEN n_a;
                p = SvPV(ERRSV, n_a);
        } else {
                p = "unknown error";
        }

I get this warning:
ffperl.c: In function `ffperlcalc':
ffperl.c:73: warning: ISO C forbids braced-groups within expressions

Should I care?

Dirk