system/nvidia-kernel: Fix ordering of arch detection

Thanks to Max Miorim for the report.

Signed-off-by: Robby Workman <rworkman@slackbuilds.org>

system/nvidia-kernel/nvidia-kernel.SlackBuild

@@ -24,15 +24,25 @@
 
 # Thanks to Robby Workman for suggestions to improve this script.
 
+PRGNAM=nvidia-kernel
+VERSION=195.36.15
+BUILD=${BUILD:-1}
+TAG=${TAG:-_SBo}
+
 KERNEL=${KERNEL:-$(uname -r)}
 KERNELPATH=${KERNELPATH:-/lib/modules/${KERNEL}/build}
 
-VERSION=195.36.15
-PRGNAM=nvidia-kernel
 PKGVER=${VERSION}_$(echo $KERNEL | tr - _)
 
-BUILD=${BUILD:-1}
-TAG=${TAG:-_SBo}
+# Automatically determine the architecture we're building on:
+if [ -z "$ARCH" ]; then
+  case "$( uname -m )" in
+    i?86) ARCH=i486 ;;
+    arm*) ARCH=arm ;;
+    # Unless $ARCH is already set, use uname -m for all other archs:
+       *) ARCH=$( uname -m ) ;;
+  esac
+fi
 
 if [ "$ARCH" = "i486" ]; then
   TARGET="x86"
@@ -46,16 +56,6 @@ unset ARCH
 
 SRCNAM=NVIDIA-Linux-$TARGET-$VERSION-pkg0
 
-# Automatically determine the architecture we're building on:
-if [ -z "$ARCH" ]; then
-  case "$( uname -m )" in
-    i?86) ARCH=i486 ;;
-    arm*) ARCH=arm ;;
-    # Unless $ARCH is already set, use uname -m for all other archs:
-       *) ARCH=$( uname -m ) ;;
-  esac
-fi
-
 CWD=$(pwd)
 TMP=${TMP:-/tmp/SBo}
 PKG=${PKG:-$TMP/package-$PRGNAM}