Do I have to free storage in a UDF if I raise an error?

If I've done a palloc() to get storage inside a user-defined function and raise an error using ereport(), should I be using pfree() to release the storage before the ereport()?

Consider this example in C:

PG_FUNCTION_INFO_V1(Example);
Datum
Example(PG_FUNCTION_ARGS) {
VarChar* pstring=PG_GETARG_VARCHAR_P(0);
VarChar* ret=NULL;

int len = VARSIZE(pstring) - VARHDRSZ;
char *string=palloc(len+1);
memcpy(string, VARDATA(pstring), len);
string[len] = '\0';

/* ... */

if ( /* some bad condition */ ) {
ereport(ERROR, (errcode(ERRCODE_DATA_EXCEPTION), errmsg("some bad condition occurred!")));
}

/* ... */

pfree(string);

if (ret == NULL)
PG_RETURN_NULL();
else
PG_RETURN_VARCHAR_P(ret);
}

I only have the pfree() at the end before the return if there is no error. If I fail to call pfree() before ereport(), do I have a memory leak?