jsreport: return error if file not open. add scan-build to travis

.travis.yml

@@ -2,10 +2,12 @@ language: c
 compiler:
   - gcc
   - clang
-script: s/travis-build
 before_install:
   - sudo apt-get update -qq
-  - sudo apt-get install -qq zlib1g-dev libtolua-dev liblua5.1-dev libncurses5-dev libsqlite3-dev libxml2-dev valgrind
+install:
+  - sudo apt-get install -qq zlib1g-dev libtolua-dev liblua5.1-dev libncurses5-dev libsqlite3-dev libxml2-dev valgrind clang
+script:
+  - s/travis-build
 os:
   - linux
   - osx

s/travis-build

@@ -4,9 +4,8 @@ set -e
 ROOT=`pwd`
 SUPP=../share/ubuntu-12_04.supp
 MACHINE=`uname -m`
+[ -z "$CC" ] && [ ! -z `which clang` ] && CC="clang"
 [ -z "$CC" ] && [ ! -z `which gcc` ] && CC="gcc"
-[ -z "$CC" ] && [ ! -z `which tcc` ] && CC="tcc"
-[ -z "$CC" ] && [ ! -z `which cc` ] && CC="cc"
 BUILD="$ROOT/build-$MACHINE-$CC-Debug"
 
 inifile() {
@@ -20,7 +19,7 @@ fi
 build() {
 cd $BUILD
 cmake -DCMAKE_MODULE_PATH=$ROOT/cmake/Modules -DCMAKE_BUILD_TYPE=Debug ..
-make
+scan-build make
 }
 
 test_valgrind_report () {

src/jsreport.c

@@ -74,7 +74,7 @@ static int report_json(const char *filename, report_context * ctx, const char *c
             }
             return 0;
         }
-        return errno;
+        return -1;
     }
     return 0;
 }