fixed wrong error type for bug 340752

- replace "UNADDRESSABLE ACCESS" with "UNINITIALIZED READ"

TBR=bruening@chromium.org
BUG=340752

Review URL: https://codereview.chromium.org/256913002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266328 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/drmemory/suppressions_full.txt

@@ -1966,7 +1966,7 @@ osmesa.dll!LINTERP
 osmesa.dll!INTERP_4F
 osmesa.dll!_tnl_generic_interp
 
-UNADDRESSABLE ACCESS
+UNINITIALIZED READ
 name=bug_340752
 ...
 *!WebCore::ThreadState::visitStack