Fixes:
pn53x.c:523:11: warning: Value stored to 'pbtRawData' is never read
pbtRawData += szRawData - 8;
^ ~~~~~~~~~~~~~
pn53x.c:544:7: warning: Value stored to 'pbtRawData' is never read
pbtRawData += 2;
^ ~
pn53x.c:532:7: warning: Value stored to 'pbtRawData' is never read
pbtRawData += 8;
^ ~
pn53x.c:3085:3: warning: Value stored to 'buflen' is never read
buflen -= res;
^ ~~~
pn53x.c:3080:3: warning: Value stored to 'buf' is never read
buf += res;
^ ~~~
target-subr.c:466:7: warning: Value stored to 'dst' is never read
dst += sprintf(dst, "* Unknown card, sorry\n");
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
target-subr.c:480:3: warning: Value stored to 'dst' is never read
dst += sprint_hex(dst, nfi.abtSysCode, 2);
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
target-subr.c:490:3: warning: Value stored to 'dst' is never read
dst += sprint_hex(dst, nji.btId, 4);
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
target-subr.c:546:7: warning: Value stored to 'dst' is never read
dst += sprintf(dst, "\n");
^ ~~~~~~~~~~~~~~~~~~
target-subr.c:571:5: warning: Value stored to 'dst' is never read
dst += sprint_hex(dst, nii.abtAtr, nii.szAtrLen);
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
target-subr.c:580:3: warning: Value stored to 'dst' is never read
dst += sprint_hex(dst, nsi.abtUID, 8);
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
target-subr.c:593:3: warning: Value stored to 'dst' is never read
dst += sprintf(dst, " Fab Code: %02X\n", nci.btFabCode);
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
target-subr.c:608:5: warning: Value stored to 'dst' is never read
dst += sprint_hex(dst, ndi.abtGB, ndi.szGB);
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2334adc8bd