soc: qcom: socinfo: Don't print anything if nothing found

Let's skip printing anything if there's nothing to see. This makes it so
the file length is 0 instead of 1, for the newline, and helps scripts
figure out if there's anything to see in these files.

Cc: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Cc: Douglas Anderson <dianders@chromium.org>
Cc: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20210628030150.2627905-1-swboyd@chromium.orgSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

drivers/soc/qcom/socinfo.c

@@ -417,8 +417,8 @@ QCOM_OPEN(chip_id, qcom_show_chip_id);
 static int show_image_##type(struct seq_file *seq, void *p)		  \
 {								  \
 	struct smem_image_version *image_version = seq->private;  \
-	seq_puts(seq, image_version->type);			  \
-	seq_putc(seq, '\n');					  \
+	if (image_version->type[0] != '\0')			  \
+		seq_printf(seq, "%s\n", image_version->type);	  \
 	return 0;						  \
 }								  \
 static int open_image_##type(struct inode *inode, struct file *file)	  \