style: kernel: comply with MISRA C:2012 Rule 15.6

Add missing braces to comply with MISRA C:2012 Rule 15.6 and
also following Zephyr's style guideline.

Signed-off-by: Pisit Sawangvonganan <[email protected]>

Author: ndrs-pst

kernel/mmu.c

@@ -887,8 +887,9 @@ void k_mem_map_phys_bare(uint8_t **virt_ptr, uintptr_t phys, size_t size, uint32
 			num_bits = adjusted_sz / CONFIG_MMU_PAGE_SIZE;
 			offset = virt_to_bitmap_offset(adjusted_start, adjusted_sz);
 			if (sys_bitarray_test_and_set_region(
-			    &virt_region_bitmap, num_bits, offset, true))
+			    &virt_region_bitmap, num_bits, offset, true)) {
 				goto fail;
+			}
 		}
 	} else {
 		/* Obtain an appropriately sized chunk of virtual memory */