ini-config : always reenable xtrace on return

These return paths doesn't renable xtrace, so output mysteriously goes
missing until the next time it is enabled.

Change-Id: I3a8018dfa9397c07534970c39fba8dc10afcbe41
diff --git a/inc/ini-config b/inc/ini-config
index 26401f3..8e7c018 100644
--- a/inc/ini-config
+++ b/inc/ini-config
@@ -104,7 +104,10 @@
     local option=$3
     local value=$4
 
-    [[ -z $section || -z $option ]] && return
+    if [[ -z $section || -z $option ]]; then
+        $xtrace
+        return
+    fi
 
     # Add it
     sed -i -e "/^\[$section\]/ a\\
@@ -123,7 +126,10 @@
     local section=$2
     local option=$3
 
-    [[ -z $section || -z $option ]] && return
+    if [[ -z $section || -z $option ]]; then
+        $xtrace
+        return
+    fi
 
     # Remove old values
     sed -i -e "/^\[$section\]/,/^\[.*\]/ { /^$option[ \t]*=/ d; }" "$file"
@@ -141,7 +147,10 @@
     local option=$3
     local value=$4
 
-    [[ -z $section || -z $option ]] && return
+    if [[ -z $section || -z $option ]]; then
+        $xtrace
+        return
+    fi
 
     if ! grep -q "^\[$section\]" "$file" 2>/dev/null; then
         # Add section at the end