s390/con3270: Use NULL instead of 0 for pointers
Get rid of sparse warnings:
CHECK drivers/s390/char/con3270.c
drivers/s390/char/con3270.c:531:15: warning: Using plain integer as NULL pointer
drivers/s390/char/con3270.c:749:15: warning: Using plain integer as NULL pointer
Signed-off-by:
Heiko Carstens <hca@linux.ibm.com>
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