mysql_adaptor: fix OOB when reading PT_DOUBLE from user_properties

==65777==ERROR: AddressSanitizer: stack-buffer-overflow
READ of size 8 at 0x7b5db59df070 thread T27
f0 propval_dup(unsigned short, void const*) lib/mapi/propval.cpp:62
f1 tpropval_array_append lib/mapi/tpropval_array.cpp:29
f2 TPROPVAL_ARRAY::set(unsigned int, void const*) lib/mapi/tpropval_array.cpp:54
f3 gromox::mysql_plugin::get_user_props(char const*, TPROPVAL_ARRAY&)
   exch/mysql_adaptor/sql2.cpp:689
f4 mysql_adaptor_get_user_properties(char const*, TPROPVAL_ARRAY&)
   exch/mysql_adaptor/sql2.cpp:903
f5 gromox::EWS::Requests::process(gromox::EWS::Structures::mResolveNamesRequest&&,
   tinyxml2::XMLElement*, gromox::EWS::EWSContext const&)
   exch/ews/requests.cpp:1376
f6 process<gromox::EWS::Structures::mResolveNamesRequest> exch/ews/ews.cpp:222

Fixes: gromox-2.9-75-ge96ad0a9e

Author: jengelh

exch/mysql_adaptor/sql2.cpp

@@ -685,7 +685,7 @@ bool mysql_plugin::get_user_props(const char *username,
 		}
 		case PT_DOUBLE:
 		case PT_APPTIME: {
-			float converted = strtof(strval, nullptr);
+			double converted = strtod(strval, nullptr);
 			if (properties.set(tag, &converted) != 0)
 				return false;
 			break;