chip-cert: Don't add newline to binary output (#29979)

* chip-cert: Don't add newline to binary output

* Add parentheses for clarity

Co-authored-by: Jonathan Mégevand <77852424+jmeg-sfy@users.noreply.github.com>

---------

Co-authored-by: Jonathan Mégevand <77852424+jmeg-sfy@users.noreply.github.com>

src/tools/chip-cert/GeneralUtils.cpp

@@ -340,8 +340,8 @@ bool WriteDataIntoFile(const char * fileName, const uint8_t * data, size_t dataL
         ExitNow(res = false);
     }
 
-    // Add new line if the output is stdout
-    if ((strcmp(fileName, "-") == 0) && (fwrite("\n", 1, 1, file) != 1))
+    // Add new line if the output is to stdout in a text format
+    if ((strcmp(fileName, "-") == 0) && (dataFmt != kDataFormat_Raw) && (fwrite("\n", 1, 1, file) != 1))
     {
         fprintf(stderr, "Unable to write to %s: %s\n", fileName, strerror(ferror(file) ? errno : ENOSPC));
         ExitNow(res = false);