iwlwifi: add missing blank, unwrap line

The original commit was missing a space between two words due to
uncareful string line wrapping; let the string run beyond the 80 char
limit in order to also make it grep-able [1].

Reported by:	jrtc27, Chris Torek (chris.torek gmail.com)
Suggested by:	emaste, imp [1]
Sponsored by:	The FreeBSD Foundation
Fixes:		87e140a avoid (hard) hang on loading module
MFC after:	3 days
X-MFC with:	87e140a
Reviewed by:	emaste
Differential Revision: https://reviews.freebsd.org/D48155

sys/contrib/dev/iwlwifi/iwl-drv.c

@@ -1760,8 +1760,8 @@ static void iwl_req_fw_callback(const struct firmware *ucode_raw, void *context)
 		 * Given this is request_module_nowait() we can simply skip it.
 		 */
 		if (bootverbose)
-		       printf("%s: module '%s' not yet available; will be"
-			   "initialized in a moment\n", __func__, op->name);
+			printf("%s: module '%s' not yet available; will be initialized in a moment\n",
+			    __func__, op->name);
 #endif
 	}
 	mutex_unlock(&iwlwifi_opmode_table_mtx);