card-iasecc.c: fix 1 compiler warning
card-iasecc.c: fix 1 compiler warning

card-iasecc.c:3206:3: error: variable 'rv' is used uninitialized whenever 'if'
      condition is false [-Werror,-Wsometimes-uninitialized]
  ...LOG_TEST_RET(ctx, SC_ERROR_INVALID_ARGUMENTS, "Need RSA_HASH_SHA1 or RSA_HASH_SHA256 algorithm");
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../src/libopensc/log.h:90:36: note: expanded from macro 'LOG_TEST_RET'
  ...r, text) SC_TEST_RET((ctx), SC_LOG_DEBUG_NORMAL, (r), (text))
              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../../src/libopensc/log.h:84:6: note: expanded from macro 'SC_TEST_RET'
        if (_ret < 0) { \
            ^~~~~~~~
card-iasecc.c:3207:20: note: uninitialized use occurs here
        LOG_TEST_RET(ctx, rv, "Cannot get QSign data");
                          ^~
../../src/libopensc/log.h:90:77: note: expanded from macro 'LOG_TEST_RET'
  ...r, text) SC_TEST_RET((ctx), SC_LOG_DEBUG_NORMAL, (r), (text))
                                                       ^
../../src/libopensc/log.h:83:14: note: expanded from macro 'SC_TEST_RET'
        int _ret = (r); \
                    ^
card-iasecc.c:3206:3: note: remove the 'if' if its condition is always true
                LOG_TEST_RET(ctx, SC_ERROR_INVALID_ARGUMENTS, "Need RSA_...
                ^
../../src/libopensc/log.h:90:36: note: expanded from macro 'LOG_TEST_RET'
                                   ^
../../src/libopensc/log.h:84:2: note: expanded from macro 'SC_TEST_RET'
        if (_ret < 0) { \
        ^
card-iasecc.c:3185:8: note: initialize the variable 'rv' to silence this warning
        int rv;
              ^
               = 0

dengert/OpenSC,dengert/OpenSC,OpenSC/OpenSC,fabled/OpenSC,AktivCo/OpenSC,LudovicRousseau/OpenSC,AktivCo/OpenSC,dengert/OpenSC,rickyepoderi/OpenSC,Jakuje/OpenSC,viktorTarasov/OpenSC-SM,Jakuje/OpenSC,CardContact/OpenSC,frankmorgner/OpenSC,LudovicRousseau/OpenSC,martinpaljak/OpenSC,metsma/OpenSC,hhonkanen/OpenSC,fabled/OpenSC,frankmorgner/OpenSC,martinpaljak/OpenSC,Jakuje/OpenSC,OpenSC/OpenSC,frankmorgner/OpenSC,AktivCo/OpenSC,jpki/OpenSC,mouse07410/OpenSC,fabled/OpenSC,martinpaljak/OpenSC,metsma/OpenSC,Jakuje/OpenSC,philipWendland/OpenSC,hongquan/OpenSC-main,hhonkanen/OpenSC,mtrojnar/OpenSC,frankmorgner/OpenSC,hongquan/OpenSC-main,viktorTarasov/OpenSC-SM,jpki/OpenSC,LudovicRousseau/OpenSC,viktorTarasov/OpenSC-SM,nmav/OpenSC,fabled/OpenSC,mtrojnar/OpenSC,rickyepoderi/OpenSC,hongquan/OpenSC-main,philipWendland/OpenSC,philipWendland/OpenSC,nmav/OpenSC,rickyepoderi/OpenSC,mouse07410/OpenSC,jpki/OpenSC,mtrojnar/OpenSC,mouse07410/OpenSC,CardContact/OpenSC,OpenSC/OpenSC,nmav/OpenSC,hhonkanen/OpenSC,metsma/OpenSC,CardContact/OpenSC