Enhance error msg and remove superfluous semicolon

[michaelortmann]

Found by: michaelortmann Patch by: michaelortmann Fixes:

One-line summary: Enhance error msg and remove superfluous semicolon

Additional description (if needed):

Test cases demonstrating functionality (if applicable): .tcl listen 1.2.3.4 2345 users Before:

.tcl listen 1.2.3.4 2345 users
Tcl error: Couldn't listen on port '2345' on the given address: Cannot assign requested address. Please check that the port is not already in use

After:

Tcl error: Couldn't listen on port 2345 on the given address '1.2.3.4': Cannot assign requested address. Please check that the port is not already in use