Fixed defects

List of Defects

Error: CPPCHECK_WARNING (CWE-758): [#def1]
librepo-1.17.0-build/librepo-1.17.0/librepo/types.h:77: error[shiftTooManyBitsSigned]: Shifting signed 32-bit value by 31 bits is undefined behaviour
#   75|       LR_AUTH_DIGEST_IE   = (1<<4),  /*!< HTTP Digest authentication with an IE flavor */
#   76|       LR_AUTH_NTLM_WB     = (1<<5),  /*!< NTLM delegating to winbind helper */
#   77|->     LR_AUTH_ONLY        = (1<<31), /*!< This is a meta symbol. OR this value
#   78|                                           together with a single specific auth
#   79|                                           value to force libcurl to probe for

Error: COMPILER_WARNING (CWE-704): [#def2]
librepo-1.17.0-build/librepo-1.17.0/librepo/xmlparser.c: scope_hint: In function ‘lr_xml_parser_generic’
librepo-1.17.0-build/librepo-1.17.0/librepo/xmlparser.c:177:33: warning[-Wdiscarded-qualifiers]: initialization discards ‘const’ qualifier from pointer target type
#  175|   
#  176|           if (xmlParseChunk(ctxt, buf, len, len == 0)) {
#  177|->             xmlErrorPtr error = xmlCtxtGetLastError(ctxt);
#  178|               ret = FALSE;
#  179|   

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