Fix conditionnal expression

build.sh

@@ -249,7 +249,7 @@ CURRENT_DEPENDENCY_TREE="$1"
 current_ver=$(get_current_version ${1})
 aur_ver=$(get_aur_version ${1})
 ver_diff=$(vercmp "${current_ver}" "${aur_ver}")
-if [[ ( "$current_ver" ) -a ( $ver_diff -eq 0 ) ]]
+if [[ ( "$current_ver" ) && ( $ver_diff -eq 0 ) ]]
 then
 	echo "Package is already up to date, no build needed"
 	echo "AUR Version:  '$aur_ver'"
@@ -258,7 +258,7 @@ then
 	create_dirs
 	save_package_from_cache "$1"
 	force_rebuild
-elif [[ ( "$current_ver" ) -a ( $ver_diff -gt 0 ) ]]
+elif [[ ( "$current_ver" ) && ( $ver_diff -gt 0 ) ]]
 then
 	echo "Package in repository is newer than package in AUR"
 	echo "AUR Version:  '$aur_ver'"