[vala/staging] build: Fix typo in --enable-debug check

[Rico Tzschichholz <ricotz src gnome org>]

commit 120e085963ccdc59d89876c41a51b24d9644f359
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Wed Nov 28 12:57:58 2018 +0100

    build: Fix typo in --enable-debug check

 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/configure.ac b/configure.ac
index 40ee02a14..16ebd1f81 100644
--- a/configure.ac
+++ b/configure.ac
@@ -83,7 +83,7 @@ if test x$enable_boostrap = xyes; then
 fi
 
 AC_ARG_ENABLE(debug, AS_HELP_STRING([--enable-debug], [Enable debug build]), enable_debug=$enableval, 
enable_debug=no)
-if test "$enable_coverage" = "yes"; then
+if test "$enable_debug" = "yes"; then
        VALAFLAGS="$VALAFLAGS -g"
        CFLAGS="$CFLAGS -g -O0"
 fi