Plugin cpu-usage-by-process: fix shellcheck issues

plugins/cpu/cpu-usage-by-process

@@ -23,9 +23,10 @@
 #%# family=auto
 #%# capabilities=autoconf
 
+procs=${procs:-}
 
 
-if [ "$1" = "autoconf" ] ; then 
+if [ "$1" = "autoconf" ] ; then
     if [ -n "$procs" ] ; then
         echo "yes"
     else
@@ -35,29 +36,29 @@ if [ "$1" = "autoconf" ] ; then
 fi
 
 if [ "$1" = "config" ] ; then
-    echo "graph_args --base 1000 -r --lower-limit 0";
-    echo "graph_title CPU usage, by process";
-    echo "graph_category processes";
-    echo "graph_info This graph shows CPU usage, for monitored processes.";
+    echo "graph_args --base 1000 -r --lower-limit 0"
+    echo "graph_title CPU usage, by process"
+    echo "graph_category processes"
+    echo "graph_info This graph shows CPU usage, for monitored processes."
         echo 'graph_vlabel %'
         echo 'graph_scale no'
         echo 'graph_period second'
 
     echo "graph_order $procs"
-    
-    FIRSTPROC=1;
-    for proc in $procs; do  
+
+    FIRSTPROC=1
+    for proc in $procs; do
         echo "${proc}.label $proc"
         echo "${proc}.info CPU used by process $proc"
         echo "${proc}.type GAUGE"
         if [ $FIRSTPROC -eq 1 ] ; then
             echo "${proc}.draw AREA"
-            export FIRSTPROC=0;
-        else    
+            export FIRSTPROC=0
+        else
             echo "${proc}.draw STACK"
         fi
-    done ;
-    
+    done
+
     exit
 fi
 
@@ -65,8 +66,7 @@ fi
 
 for proc in $procs ; do {
 
-    ps axo 'pcpu,comm' | grep "$proc" |
-    awk '
+    ps axo 'pcpu,comm' | grep "$proc" | awk '
     BEGIN {
         FS=" "
         CPU_PROC=0
@@ -76,9 +76,9 @@ for proc in $procs ; do {
         CPU_PROC+=$0
     }
 
-    END { 
-    print  "'$proc'.value "CPU_PROC
-    }'  
+    END {
+    print  "'"$proc"'.value "CPU_PROC
+    }'
 }
 
-done;
+done