tests: Rename virtTestDifferenceBin to virTestDifferenceBin.

This function doesn't follow our convention of naming functions.

tests/testutils.c

@@ -625,7 +625,7 @@ virTestDifference(FILE *stream,
  * Display expected and actual output text, trimmed to
  * first and last characters at which differences occur
  */
-int virtTestDifferenceBin(FILE *stream,
+int virTestDifferenceBin(FILE *stream,
                          const char *expect,
                          const char *actual,
                          size_t length)

tests/testutils.h

@@ -69,7 +69,7 @@ int virTestDifferenceFullNoRegenerate(FILE *stream,
                                       const char *expectName,
                                       const char *actual,
                                       const char *actualName);
-int virtTestDifferenceBin(FILE *stream,
+int virTestDifferenceBin(FILE *stream,
                          const char *expect,
                          const char *actual,
                          size_t length);

tests/virnetmessagetest.c

@@ -77,7 +77,7 @@ static int testMessageHeaderEncode(const void *args ATTRIBUTE_UNUSED)
     }
 
     if (memcmp(expect, msg->buffer, sizeof(expect)) != 0) {
-        virtTestDifferenceBin(stderr, expect, msg->buffer, sizeof(expect));
+        virTestDifferenceBin(stderr, expect, msg->buffer, sizeof(expect));
         goto cleanup;
     }
 
@@ -269,7 +269,7 @@ static int testMessagePayloadEncode(const void *args ATTRIBUTE_UNUSED)
     }
 
     if (memcmp(expect, msg->buffer, sizeof(expect)) != 0) {
-        virtTestDifferenceBin(stderr, expect, msg->buffer, sizeof(expect));
+        virTestDifferenceBin(stderr, expect, msg->buffer, sizeof(expect));
         goto cleanup;
     }
 
@@ -511,7 +511,7 @@ static int testMessagePayloadStreamEncode(const void *args ATTRIBUTE_UNUSED)
     }
 
     if (memcmp(expect, msg->buffer, sizeof(expect)) != 0) {
-        virtTestDifferenceBin(stderr, expect, msg->buffer, sizeof(expect));
+        virTestDifferenceBin(stderr, expect, msg->buffer, sizeof(expect));
         goto cleanup;
     }