Use xargs -0 instead of sed, as this is easier to understand.

Fixed atom/atom#4337
Fixes atom/atom#4336

atom.sh

@@ -50,7 +50,7 @@ if [ $OS == 'Mac' ]; then
 
   # If ATOM_PATH isn't a executable file, use spotlight to search for Atom
   if [ ! -x "$ATOM_PATH/$ATOM_APP_NAME" ]; then
-    ATOM_PATH="$(mdfind "kMDItemCFBundleIdentifier == 'com.github.atom'" | grep -v ShipIt | sed '{s#/[^/]*$##; q; }')"
+    ATOM_PATH="$(mdfind "kMDItemCFBundleIdentifier == 'com.github.atom'" | grep -v ShipIt | head -1 | xargs -0 dirname)"
   fi
 
   # Exit if Atom can't be found