ps: ensure fields are separated by at least one space, closes 11826

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/procps/ps.c b/procps/ps.c
index 54e6c40..815c115 100644
--- a/procps/ps.c
+++ b/procps/ps.c
@@ -533,7 +533,7 @@
 		len = out[i].width - len + 1;
 		if (++i == out_cnt) /* do not pad last field */
 			break;
-		p += sprintf(p, "%*s", len, "");
+		p += sprintf(p, "%*s", len, " "); /* " ", not "", to ensure separation of fields */
 	}
 	printf("%.*s\n", terminal_width, buffer);
 }