weak-modules: split modules into array with read -a

Coverity reports warning for splitting mods=($i)
`Quote to prevent word splitting/globbing, or split robustly with mapfile or read -a.`

Even if it can not cause problems for weak-modules case where the
list is coming from modules.dep, use the recommended read -a method.

Signed-off-by: Yauheni Kaliuta <ykaliuta@redhat.com>

weak-modules

@@ -935,7 +935,7 @@ do_make_groups()
     declare -a mods
 
     while read i; do
-        mods=($i)
+        read -a mods <<< "$i"
 
         echo "${mods[0]}" |grep -q "extra/" || continue
 
@@ -987,7 +987,7 @@ filter_extra_absoluted()
         # to speed up handling in general cases
         echo "$i" |grep -q "extra/" || continue
 
-        mods=($i)
+        read -a mods <<< "$i"
         for j in "${!mods[@]}"; do
             mod="${mods[$j]}"