zpool: activate: don't eval procfs read, if it fails it should be fatal

highly unlikely to fail in our setups, most realistic case is when
procfs is not mounted at /proc, which breaks much else anyway and is
a requirement

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

PVE/Storage/ZFSPoolPlugin.pm

@@ -530,8 +530,7 @@ sub activate_storage {
     my $pool = ($dataset =~ s!/.*$!!r);
 
     my $dataset_mounted = sub {
-	my $mounts = eval { PVE::ProcFSTools::parse_proc_mounts() };
-	warn "$@\n" if $@;
+	my $mounts = PVE::ProcFSTools::parse_proc_mounts();
 	foreach my $mp (@$mounts) {
 	    my ($what, $dir, $fs) = @$mp;
 	    next if $fs ne 'zfs';