zeromq: Remove useless space

Be coherent with all the other ifeq check where there's no space.
>From the doc of Make, it should not cause any trouble, but coherence has
its own merit.

Signed-off-by: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/zeromq/zeromq.mk

@@ -36,7 +36,7 @@ ZEROMQ_CONF_OPTS += --with-system-pgm
 endif
 
 # ZeroMQ uses libsodium if it's available.
-ifeq ($(BR2_PACKAGE_LIBSODIUM), y)
+ifeq ($(BR2_PACKAGE_LIBSODIUM),y)
 ZEROMQ_DEPENDENCIES += libsodium
 ZEROMQ_CONF_OPTS += --with-libsodium="$(STAGING_DIR)/usr"
 else