Use pacman -Sp for figuring out the repo a package is in

Signed-off-by: fbt <fbt@fleshless.org>

prm

@@ -303,11 +303,7 @@ main() {
 			if (( ! "$?" )); then
 				repo='aur'
 			else
-				while read -r; do
-					if [[ "$REPLY" =~ ^Repository ]]; then
-						repo="${REPLY##* }"
-					fi
-				done < <( pacman -Si "$package" )
+				read -r repo < <( pacman -Sp --print-format '%r' )
 
 				[[ "$repo" ]] || {
 					err "Can't find package %s\n" "$package"