fix testsuite to tolerate spaces in path

This patch allows the testsuite to run properly when the full path to
the git sources contains spaces or other symbols that need to be quoted.

Signed-off-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

t/t5300-pack-object.sh

@@ -49,7 +49,7 @@ test_expect_success \
      git-unpack-objects <test-1-${packname_1}.pack"
 
 unset GIT_OBJECT_DIRECTORY
-cd $TRASH/.git2
+cd "$TRASH/.git2"
 
 test_expect_success \
     'check unpack without delta' \
@@ -61,7 +61,7 @@ test_expect_success \
 	     return 1
 	 }
      done'
-cd $TRASH
+cd "$TRASH"
 
 test_expect_success \
     'pack with delta' \
@@ -80,7 +80,7 @@ test_expect_success \
      git-unpack-objects <test-2-${packname_2}.pack'
 
 unset GIT_OBJECT_DIRECTORY
-cd $TRASH/.git2
+cd "$TRASH/.git2"
 test_expect_success \
     'check unpack with delta' \
     '(cd ../.git && find objects -type f -print) |
@@ -91,7 +91,7 @@ test_expect_success \
 	     return 1
 	 }
      done'
-cd $TRASH
+cd "$TRASH"
 
 rm -fr .git2
 mkdir .git2