[PATCH:modular] build.sh: fix test error message when modules file not supplied

[Alan Coopersmith]

Seems to be harmless, just noisy message:
git/util/modular/build.sh[1323]: [: argument expected

sh -x shows it was coming from expanding:
if [ X"$BUILT_MODULES_FILE" != X -a -r $BUILT_MODULES_FILE ]

to:
+ [ X '!=' X -a -r ]

Adding quotes ensures the shell sees an empty argument instead of none.

Signed-off-by: Alan Coopersmith <alan.coopersmith at oracle.com>
---
 build.sh |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/build.sh b/build.sh
index a3eaf77..2093644 100755
--- a/build.sh
+++ b/build.sh
@@ -1320,7 +1320,7 @@ fi
 # if   there is a BUILT_MODULES_FILE
 # then start off by checking for and trying to build any modules which failed
 #      and aren't the last line
-if [ X"$BUILT_MODULES_FILE" != X -a -r $BUILT_MODULES_FILE ]; then
+if [ X"$BUILT_MODULES_FILE" != X -a -r "$BUILT_MODULES_FILE" ]; then
     built_lines=`cat $BUILT_MODULES_FILE | wc -l | sed 's:^ *::'`
     built_lines_m1=`expr $built_lines - 1`
     orig_BUILT_MODULES_FILE=$BUILT_MODULES_FILE
-- 
1.7.3.2