radical re-formatting 3/3: Error checks

Check for `< 0` instead of `== -1`.

Fixes coding style. Formatting commits suck, incoherent coding style
sucks more.
https://suckless.org/coding_style/

components/swap.c

@@ -204,7 +204,7 @@
 			return 0;
 		}
 
-		if(kvm_getswapinfo(kd, swap_info, size, 0 /* Unused flags */) == -1) {
+		if (kvm_getswapinfo(kd, swap_info, size, 0 /* Unused flags */) < 0) {
 			warn("kvm_getswapinfo:");
 			kvm_close(kd);
 			return 0;