Fix bashisms: add quotes around paths

scripts/common.sh

Index: scripts/common.sh
===================================================================
--- scripts/common.sh	(revision 56518)
+++ scripts/common.sh	(working copy)
@@ -20,7 +20,7 @@
   # $3 = source dir
   # Checkout Valgrind, apply our patches to Valgrind.
   # The source will be put in $THISDIR/valgrind-source
-  cd $THISDIR
+  cd "$THISDIR"
   VG_REV="$1"
   VEX_REV="$2"
   SOURCE_DIR="$3"
@@ -152,7 +152,7 @@
 
   # Delete un-needed stuff from the $OUTPUT_DIR
   # TODO(timurrrr): probably, we should just don't build the unused tools
-  cd $OUTPUT_DIR
+  cd "$OUTPUT_DIR"
   rm -rf include
   rm -rf lib/pkgconfig lib/*.a
   rm bin/*cg_* bin/callgrind*
@@ -177,7 +177,7 @@
   fi
 
   # We're done
-  cd $PREV_DIR
+  cd "$PREV_DIR"
   # }}}
 }
 
@@ -229,7 +229,7 @@
 
 # Check that the binaries directory exists.
 BINARIES_DIR="$THISDIR/../binaries"
-if ! [ -a $BINARIES_DIR ]
+if ! [ -a "$BINARIES_DIR" ]
 then
   echo "Error: $BINARIES_DIR doesn't exist!" >&2
   exit 1