dracut-lib.sh: fixed return value of pidof()

pidof always returned with 0, so any "while pidof" loop would not
terminate.

Thanks "Consus" for the hint!

(cherry picked from commit 4e58a1ffc7)

modules.d/99base/dracut-lib.sh

@@ -962,6 +962,7 @@ if ! command -v pidof >/dev/null 2>/dev/null; then
         local _cmd
         local _exe
         local _rl
+        local _ret=1
         local i
         _cmd="$1"
         [ -z "$_cmd" ] && return 1
@@ -976,8 +977,9 @@ if ! command -v pidof >/dev/null 2>/dev/null; then
             fi
             i=${i%/exe}
             echo ${i##/proc/}
+            _ret=0
         done
-        return 0
+        return $_ret
     }
 fi