oe-build-perf-report: Fix missing buildstats comparisions

Integers were being compared to strings leading to missing buildstats comparision
data. Fix this.

(From OE-Core rev: 2dbbf598192ae2b3aa488df042f56aa6c6634a00)

(From OE-Core rev: 9ee8845a583a3fa9e9b07d1b0301201ae56c6c41)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/oe-build-perf-report

@@ -427,8 +427,8 @@ def print_html_report(data, id_comp, buildstats):
 
             # Compare buildstats
             bs_key = test + '.' + meas
-            rev = metadata['commit_num']['value']
-            comp_rev = metadata['commit_num']['value_old']
+            rev = str(metadata['commit_num']['value'])
+            comp_rev = str(metadata['commit_num']['value_old'])
             if (rev in buildstats and bs_key in buildstats[rev] and
                     comp_rev in buildstats and bs_key in buildstats[comp_rev]):
                 new_meas['buildstats'] = BSSummary(buildstats[comp_rev][bs_key],