Value returned from a function is not checked for errors before being used

Defect 72817 (STATIC_C)
Checker CHECKED_RETURN (subcategory none)
File: /src/mongo/util/debugger.cpp
Function mongo::breakpoint()
/src/mongo/util/debugger.cpp, line: 52
Calling "sigaction" without checking return value (as is done elsewhere 15 out of 17 times).

            sigaction(SIGTRAP, NULL, &current);