Whitespace cleanup

* remove trailing whitespace
* remove empty lines at the end of files

plugins/zfs/zfs_arcstats

@@ -25,7 +25,7 @@
   For FreeBSD, it should be necessary to change shebang /bin/bash -> /usr/local/bin/bash
 
 =head1 ENVIRONMENT VARIABLES
- 
+
   None
 
 =head1 AUTHOR
@@ -66,7 +66,7 @@ get_osname() {
     SunOS)
         case $osver in
         illumos*)
-            osname=illumos 
+            osname=illumos
         ;;
         esac
     ;;
@@ -84,7 +84,7 @@ preconfig() {
     case $func in
     size)
         global_attr="
-            graph_title ZFS ARC - Size 
+            graph_title ZFS ARC - Size
             graph_category fs
             graph_args --base 1024 --lower-limit 0
             graph_vlabel Bytes
@@ -150,7 +150,7 @@ preconfig() {
         "
         data_attr="
             mfu_ghost_hits DERIVE LINE dummy
-            mfu_hits       DERIVE LINE MFU 
+            mfu_hits       DERIVE LINE MFU
             mru_ghost_hits DERIVE LINE dummy
             mru_hits       DERIVE LINE MRU
         "
@@ -219,12 +219,12 @@ preconfig() {
         echo "Unknown function: $func"
         exit 1
         ;;
-    esac 
+    esac
 }
 
 do_config() {
     local func=$1
-    local label_max_length=45 
+    local label_max_length=45
     local field type draw label
 
     preconfig "$func"
@@ -254,7 +254,7 @@ do_config() {
 
 get_stats() {
     local arcstats stat value
-    
+
     case $osname in
     SunOS|illumos)
         arcstats=$( kstat -p 'zfs:0:arcstats' | sed -e 's/:/ /g' | awk '{ print $4,$5 }' )
@@ -286,8 +286,8 @@ get_stats() {
     esac
 
     while read -r stat value
-    do 
-        printf -v "arcstats_${stat}" "%s" "$value" 
+    do
+        printf -v "arcstats_${stat}" "%s" "$value"
         # printf -v means indirect variable assignment (similar to eval)
     done <<< "$arcstats"
 }
@@ -303,8 +303,8 @@ do_fetch() {
     do
         [ -z "$field" ] && continue
 
-        ref="arcstats_${field}" 
-        value=${!ref:-0} 
+        ref="arcstats_${field}"
+        value=${!ref:-0}
         # ${!varname} means indirect evaluation (similar to eval)
 
         echo "${field}.value ${value}"