logging: Fix logical operator use

Replace & with &&. In that case there is no difference in the
behavior but logical operator should be used here.

Signed-off-by: Krzysztof Chruściński <krzysztof.chruscinski@nordicsemi.no>

include/zephyr/logging/log_core.h

@@ -290,7 +290,7 @@ static inline char z_log_minimal_level_to_char(int level)
 		break; \
 	} \
 	/* For instance logging check instance specific static level */ \
-	if (_inst & !IS_ENABLED(CONFIG_LOG_RUNTIME_FILTERING)) { \
+	if (_inst && !IS_ENABLED(CONFIG_LOG_RUNTIME_FILTERING)) { \
 		if (_level > ((struct log_source_const_data *)_source)->level) { \
 			break; \
 		} \