Use block for single statement ifs
When functions return -1 for error test against 0 not -1
Newlines

display ESSID and signal strength percentage

The swapctl(2) function fills the swapent struct with 512KB blocks.
As we want to display in GB, i just modified the calculation for this to
get the expected output.

To reproduce the issue:
	$ slstatus -s | tee

then it would print only when the stdout buffer is full, by block
of multiple lines.

fflush() makes sure the line is printed at every loop iteration

sys/sensors.h has two structs struct timeval: sensor and ksensor:

	struct sensor {
		...
		struct timeval tv;		/* sensor value last change time */
		...
	};

- Sort Alphabetically
- Same indentation for preprocessor clauses

OpenBSD's entropy design is superior to Linux.

- Use block for single statement ifs
- Keep lines to reasonable length (current debate as to reasonable)
- When functions return -1 for error test against 0 not -1
- Do not indent cases another level
- Do not test against NULL and 0 explicitly
- Use tabs for indentation, use spaces for alignment

The third value from load_avg (idle) gives us almost the same
information as cpu_iowait. Plus OpenBSD does not offer an iowait value
as Linux and thus the corresponding function would not be portable.

In OpenBSD the CPU usage in percent is now computed using KERN_CPTIME
sysctl.

It does not respect charging thresholds and it is not trivial to
implement the indicator in OpenBSD.

- Battery power cannot be easily gatherable via apm(4)
- IMHO it does not represent essential information

Be consistent with brackets and add a comment for OpenBSD to make it
clearer what the actual intent of the uncommented line is.

In the Makefile, add a dependency of slstatus.o from config.mk.