[PATCH] tests: fix use of fixedcontent variable

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Commit 8563560026d192c2cf047b550ffd468692245ed6 switched from
hardcoded use of strcontent to hardcoded use of fixedcontent
(fixedcontent is *sometimes* a copy of strcontent with a \n
appended). This was a problem because sometimes fixedcontent is *not*
a copy of strcontent, but is instead NULL, leading to the regenerated
test case output being a 0 length file.

This patch creates a new const char *cmpcontent initialized to
strcontent, but changed to fixedcontent if/when fixedcontent is
created, then always uses cmpcontent instead of (str|fixed)content.
---
 tests/testutils.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/tests/testutils.c b/tests/testutils.c
index f87628e..c934785 100644
--- a/tests/testutils.c
+++ b/tests/testutils.c
@@ -694,6 +694,7 @@ virTestCompareToFile(const char *strcontent,
     int ret = -1;
     char *filecontent = NULL;
     char *fixedcontent = NULL;
+    const char *cmpcontent = strcontent;
 
     if (virTestLoadFile(filename, &filecontent) < 0 && !virTestGetRegenerate())
         goto failure;
@@ -703,13 +704,13 @@ virTestCompareToFile(const char *strcontent,
         strcontent[strlen(strcontent) - 1] != '\n') {
         if (virAsprintf(&fixedcontent, "%s\n", strcontent) < 0)
             goto failure;
+        cmpcontent = fixedcontent;
     }
 
-    if (STRNEQ_NULLABLE(fixedcontent ? fixedcontent : strcontent,
-                        filecontent)) {
+    if (STRNEQ_NULLABLE(cmpcontent, filecontent)) {
         virTestDifferenceFull(stderr,
                               filecontent, filename,
-                              fixedcontent, NULL);
+                              cmpcontent, NULL);
         goto failure;
     }
 
-- 
2.7.4

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