Fix shellcheck warnings

dkms.in

@@ -826,7 +826,7 @@ get_module_verinfo(){
     local vals
     vals=
     while read -ra vals; do
-        [[ $vals ]] || continue
+        [[ ${vals[0]} ]] || continue
         case "${vals[0]}" in
             version:)
                 ver="${vals[1]}"
@@ -1989,9 +1989,9 @@ module_status_weak() {
         else
             continue
         fi
-        IFS=/ read m v k a <<<"$(IFS=$oifs find_module_from_ko "$weak_ko")"
+        IFS=/ read -r m v k a <<<"$(IFS=$oifs find_module_from_ko "$weak_ko")"
         [[ $m ]] || continue
-        kern=${weak_ko#$install_tree/}
+        kern=${weak_ko#"$install_tree"/}
         kern=${kern%/weak-updates/*}
         [[ $m = "${1:-*}" && $v = "${2:-*}" && $k = "${5:-*}" && $a = "${4:-*}" && $kern = "${3:-*}" ]] || continue
         already_found[$m/$v/$kern/$a/$k]+=${weak_ko##*/}" "
@@ -2023,7 +2023,7 @@ do_status_weak()
     local status
     while read -r status mvka; do
         [[ $status ]] || continue
-        IFS=/ read m v k a kern <<< "$mvka"
+        IFS=/ read -r m v k a kern <<< "$mvka"
         echo "$m, $v, $k, $a: installed-weak from $kern"
     done <<< "$(module_status_weak "$@")"
 }
@@ -2439,7 +2439,7 @@ run_match()
         fi
         maybe_build_module "$template_module" "$template_version" "$kernelver" "$arch"
         maybe_install_module "$template_module" "$template_version" "$kernelver" "$arch"
-    done <<< "$(echo "$template_kernel_status")"
+    done <<< "$template_kernel_status"
 }
 
 report_build_problem()
@@ -2579,7 +2579,7 @@ autoinstall() {
     # a list of modules and their latest version.
     while read -r status mvka; do
     	[[ $status ]] || continue
-        IFS='/' read m v k a <<< "$mvka"
+        IFS='/' read -r m v k a <<< "$mvka"
         # If the module status is broken there is nothing that can be done
         if [[ $status = broken ]]; then
             error "$m/$v is broken! Missing the source directory or the symbolic link pointing to it."\