Coverity: Check return value of getfilecon().
    
    Error: CHECKED_RETURN:
    patch-2.6.1/src/pch.c:736: check_return: Calling function "getfilecon" without checking return value (as is done elsewhere 4 out of 5 times).
    patch-2.6.1/src/inp.c:158: example_checked: "getfilecon(inname, &incontext)" has its value checked in "getfilecon(inname, &incontext) == -1".
    patch-2.6.1/src/patch.c:434: example_checked: "getfilecon(outname, &outcontext)" has its value checked in "getfilecon(outname, &outcontext) != -1".
    patch-2.6.1/src/pch.c:292: example_checked: "getfilecon(inname, &incontext)" has its value checked in "getfilecon(inname, &incontext) == -1".
    patch-2.6.1/src/util.c:603: example_checked: "getfilecon(filename, filecontext)" has its value checked in "getfilecon(filename, filecontext) == -1".
    patch-2.6.1/src/pch.c:736: unchecked_value: No check of the return value of "getfilecon(inname, &incontext)".