scripts: Fix quoting to prevent unintended word splitting

scripts/check-tracegen.sh

@@ -13,11 +13,11 @@ AXE_SHRINK=${AXE_DIR}/src/axe-shrink.py
 PATH=$PATH:${AXE_DIR}/src
 
 grep '.*:.*#.*@' $1 > /tmp/clean-trace.txt
-$TO_AXE /tmp/clean-trace.txt > /tmp/trace.axe
-result=$($AXE check wmo /tmp/trace.axe)
+"$TO_AXE" /tmp/clean-trace.txt > /tmp/trace.axe
+result=$("$AXE" check wmo /tmp/trace.axe)
 
-if [ $result != "OK" ]; then
-    $AXE_SHRINK wmo /tmp/trace.axe
+if [ "$result" != OK ]; then
+    "$AXE_SHRINK" wmo /tmp/trace.axe
 else
-    echo "OK"
+    echo OK
 fi