[Rpm-maint] [rpm-software-management/rpm] Fix some resource leaks when running rpmbuild (PR #2293)

[xujing]

@JetXujing commented on this pull request.



> @@ -276,7 +279,11 @@ static int doBuildRequires(rpmSpec spec, int test)
 
  exit:
     freeStringBuf(sb_stdout);
-    free(output);
+    if (output) {

Thank you for the tip, I've made the relevant changes.

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