Return 1 instead of -1 from semver/deb

contrib/semver/name.sh

@@ -6,7 +6,7 @@ BRANCH=$(git symbolic-ref --short HEAD 2>/dev/null)
 # Complain if the git history is not available
 if [ $? != 0 ]; then
   printf "unknown"
-  exit -1
+  exit 1
 fi
 
 # Remove "/" characters from the branch name if present

contrib/semver/version.sh

@@ -19,11 +19,11 @@ if [ $? != 0 ]; then
   # Complain if the git history is not available
   if [ $? != 0 ]; then
     printf 'unknown'
-    exit -1
+    exit 1
   fi
 
   printf 'v0.0.%d' "$PATCH"
-  exit -1
+  exit 1
 fi
 
 # Get the number of merges on the current branch since the last tag