raid6check: Fix memory leaks detected by valgrind
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2389947== 24 bytes in 1 blocks are definitely lost in loss record 1 of 10
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2389947== at 0x4C2B3F8: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
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2389947== by 0x408067: xmalloc (xmalloc.c:36)
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2389947== by 0x401B19: check_stripes (raid6check.c:151)
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2389947== by 0x4030C6: main (raid6check.c:521)
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2389947==
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2389947== 24 bytes in 1 blocks are definitely lost in loss record 2 of 10
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2389947== at 0x4C2B3F8: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
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2389947== by 0x408067: xmalloc (xmalloc.c:36)
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2389947== by 0x401B67: check_stripes (raid6check.c:155)
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2389947== by 0x4030C6: main (raid6check.c:521)
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2389947==
Signed-off-by: Bernd Schubert <bernd.schubert@fastmail.fm>
Signed-off-by: NeilBrown <neilb@suse.de>