Fixed some VS2017 compilation error and warnings

[raspopov]

/W1 VS2017

mosquitto\lib\net_mosq.c(433): error C4703: potentially uninitialized local pointer variable 'ainfo_bind' used
mosquitto\lib\net_mosq.c(922): warning C4133: 'function': incompatible types - from 'int *' to 'const char *'

/W4 VS2017 (without TLS)

mosquitto\lib\send_connect.c(140): warning C4267: 'function': conversion from 'size_t' to 'uint16_t', possible loss of data
mosquitto\lib\send_connect.c(142): warning C4267: 'function': conversion from 'size_t' to 'uint16_t', possible loss of data

mosquitto\lib\mosquitto.c(59): warning C4244: 'function': conversion from 'ULONGLONG' to 'unsigned int', possible loss of data
mosquitto\lib\mosquitto.c(591): warning C4018: '<': signed/unsigned mismatch

mosquitto\lib\loop.c(108): warning C4018: '>': signed/unsigned mismatch
mosquitto\lib\loop.c(324): warning C4701: potentially uninitialized local variable 'rc' used
mosquitto\lib\loop.c(401): warning C4701: potentially uninitialized local variable 'rc' used
mosquitto\lib\loop.c(417): warning C4701: potentially uninitialized local variable 'rc' used

mosquitto\lib\misc_mosq.c(71): warning C4057: 'function': 'LPDWORD' differs in indirection to slightly different base types from 'int *'

Then please check the following list of things we ask for in your pull request:

• Have you signed the Eclipse Contributor Agreement, using the same email address as you used in your commits?
• Do each of your commits have a "Signed-off-by" line, with the correct email address? Use "git commit -s" to generate this line for you.
• If you are contributing a new feature, is your work based off the develop branch?
• If you are contributing a bugfix, is your work based off the fixes branch?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you successfully run make test with your changes locally?

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[ralight]

Thank you, they all look fine.