swapfiles: make sure /proc/swaps exists

If CONFIG_SWAP is turned off in the kernel, this file may not exist. In
that case, we should not try to read from it.

reported-by: <walter@pratyeka.org>
X-Gentoo-Bug: 430378
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=430378

init.d/swapfiles.in

@@ -31,6 +31,7 @@ stop()
 
 	case "$RC_UNAME" in
 		Linux)
+			if [ -e /proc/swaps ]; then
 				while read filename type rest; do
 					case "$type" in
 						file) swapoff $filename >/dev/null;;
@@ -39,6 +40,7 @@ stop()
 						/dev/loop*) swapoff $filename >/dev/null;;
 					esac
 				done < /proc/swaps
+			fi
 			;;
 	esac
 	eend 0