More abstraction is better, also guards against invalid internal use.

Signed-off-by: Jani Nikula <jani.nik...@intel.com>
---
 dim | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/dim b/dim
index a2c0d74c37e8..5833306e35c5 100755
--- a/dim
+++ b/dim
@@ -591,6 +591,11 @@ function dim_create_workdir
 # dim_pull_request branch upstream
 function dim_pull_request
 {
+       if [[ "x$1" = "x" || "x$2" = "x" ]]; then
+               echo "usage: $0 $subcommand branch upstream"
+               exit 1
+       fi
+
        branch=$1
        upstream=$2
 
@@ -874,10 +879,6 @@ case "$subcommand" in
                $DRY git cherry-pick $1
                ;;
        pull-request)
-               if [[ "x$1" = "x" || "x$2" = "x" ]]; then
-                       echo "usage: $0 $subcommand branch upstream"
-                       exit 1
-               fi
                dim_pull_request $*
                ;;
        pull-request-next)
-- 
2.1.4

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