HBASE-14310 test-patch.sh should handle spurious non-zero exit code from maven

dev-support/test-patch.sh

@@ -335,11 +335,14 @@ setup () {
   $MVN clean package checkstyle:checkstyle-aggregate findbugs:findbugs -DskipTests \
 	 -D${PROJECT_NAME}PatchProcess > $PATCH_DIR/trunkJavacWarnings.txt 2>&1
   if [[ $? != 0 ]] ; then
+    echo "mvn exit code was $?"
     ERR=`$GREP -A 5 'Compilation failure' $PATCH_DIR/trunkJavacWarnings.txt`
+    if [[ ${#ERR} -ge 1 ]] ; then
       echo "Trunk compilation is broken?
       {code}$ERR{code}"
       cleanupAndExit 1
     fi
+  fi
   mv target/checkstyle-result.xml $PATCH_DIR/trunkCheckstyle.xml
   collectFindbugsReports trunk $BASEDIR $PATCH_DIR
 }