dmi.c: Remove unneeded 'else'

'else' is not needed after a 'break' or 'return'.

Change-Id: I71ab1fec98c2b61d73aeb646ddfc810662d4136d
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/33344
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

dmi.c

@@ -320,9 +320,8 @@ static char *get_dmi_string(const char *string_name)
 				msg_perr("DMI pipe read error\n");
 				pclose(dmidecode_pipe);
 				return NULL;
-			} else {
-				answerbuf[0] = 0;	/* Hit EOF */
 			}
+			answerbuf[0] = 0;	/* Hit EOF */
 		}
 	} while (answerbuf[0] == '#');