setlocalversion: make indentation shallower

Return earlier if we are not in the correct git repository. This makes
the code more readable.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>

scripts/setlocalversion

@@ -34,12 +34,16 @@ scm_version()
 		short=true
 	fi
 
-	# Check for git and a git repo.
-	if test -z "$(git rev-parse --show-cdup 2>/dev/null)" &&
-	   head=$(git rev-parse --verify HEAD 2>/dev/null); then
+	if test -n "$(git rev-parse --show-cdup 2>/dev/null)"; then
+		return
+	fi
+
+	if ! head=$(git rev-parse --verify HEAD 2>/dev/null); then
+		return
+	fi
 
-		# If we are at a tagged commit (like "v2.6.30-rc6"), we ignore
-		# it, because this version is defined in the top level Makefile.
+	# If we are at a tagged commit (like "v2.6.30-rc6"), we ignore it
+	# because this version is defined in the top level Makefile.
 	if [ -z "$(git describe --exact-match 2>/dev/null)" ]; then
 
 		# If only the short version is requested, don't bother
@@ -59,22 +63,21 @@ scm_version()
 	fi
 
 	# Check for uncommitted changes.
-		# This script must avoid any write attempt to the source tree,
-		# which might be read-only.
-		# You cannot use 'git describe --dirty' because it tries to
-		# create .git/index.lock .
-		# First, with git-status, but --no-optional-locks is only
-		# supported in git >= 2.14, so fall back to git-diff-index if
-		# it fails. Note that git-diff-index does not refresh the
-		# index, so it may give misleading results. See
-		# git-update-index(1), git-diff-index(1), and git-status(1).
+	# This script must avoid any write attempt to the source tree, which
+	# might be read-only.
+	# You cannot use 'git describe --dirty' because it tries to create
+	# .git/index.lock .
+	# First, with git-status, but --no-optional-locks is only supported in
+	# git >= 2.14, so fall back to git-diff-index if it fails. Note that
+	# git-diff-index does not refresh the index, so it may give misleading
+	# results.
+	# See git-update-index(1), git-diff-index(1), and git-status(1).
 	if {
 		git --no-optional-locks status -uno --porcelain 2>/dev/null ||
 		git diff-index --name-only HEAD
 	} | read dummy; then
 		printf '%s' -dirty
 	fi
-	fi
 }
 
 collect_files()