Fixed defects

List of Defects

Error: CPPCHECK_WARNING: [#def1]
zxing-cpp-2.0.0-build/zxing-cpp-2.0.0/core/src/datamatrix/DMDecoder.cpp: information[normalCheckLevelMaxBranches]: Limiting analysis of branches. Use --check-level=exhaustive to analyze all branches.

Error: COMPILER_WARNING (CWE-457): [#def2]
zxing-cpp-2.0.0-build/zxing-cpp-2.0.0/core/src/libzueci/zueci.c: scope_hint: In function ‘zueci_eci_to_utf8’
zxing-cpp-2.0.0-build/zxing-cpp-2.0.0/core/src/libzueci/zueci.c:1593:13: warning[-Wmaybe-uninitialized]: ‘replacement_len’ may be used uninitialized
# 1593 |             memcpy(d, replacement, replacement_len);
#      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
zxing-cpp-2.0.0-build/zxing-cpp-2.0.0/core/src/libzueci/zueci.c:1503:9: note: ‘replacement_len’ was declared here
# 1503 |     int replacement_len;
#      |         ^~~~~~~~~~~~~~~
# 1591|                   return ZUECI_ERROR_INVALID_DATA;
# 1592|               }
# 1593|->             memcpy(d, replacement, replacement_len);
# 1594|               s += zueci_replacement_incr(eci, s, (int) (se - s));
# 1595|               d += replacement_len;

Error: CPPCHECK_WARNING: [#def3]
zxing-cpp-2.0.0-build/zxing-cpp-2.0.0/core/src/pdf417/PDFDecodedBitStreamParser.cpp: information[normalCheckLevelMaxBranches]: Limiting analysis of branches. Use --check-level=exhaustive to analyze all branches.

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