correct 'duplicate checking' in scanforsrcs.pl script
correct 'duplicate checking' in scanforsrcs.pl script

The hash was being set and checked incorrectly in the script, looking
for duplicate module id / reason code tags. Previous code would only
find duplicates if they were consecutive in the code. Fixed code
correctly finds duplicates even if they are in different files.

Change-Id: I80de8a7071c298533c3f6cb1777aa074020afa62
Depends-on: Ib0717d6ea916fbc330cadd5dce420cc80694eaf0
RTC: 38731
Reviewed-on: http://gfw160.austin.ibm.com:8080/gerrit/918
Tested-by: Jenkins Server
Reviewed-by: A. Patrick Williams III <c87e37b1a4035affd737b461af89fb722d635f4d@us.ibm.com>

Over-enthusiastic/hostboot,open-power/hostboot,open-power/hostboot,csmart/hostboot,Over-enthusiastic/hostboot,alvintpwang/hostboot,csmart/hostboot,Over-enthusiastic/hostboot,open-power/hostboot,open-power/hostboot,alvintpwang/hostboot,open-power/hostboot,alvintpwang/hostboot,Over-enthusiastic/hostboot,csmart/hostboot,csmart/hostboot,alvintpwang/hostboot,alvintpwang/hostboot,Over-enthusiastic/hostboot,csmart/hostboot