spelling: s/retreive/retrieve/

Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index 5bb433c..149351a 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -368,7 +368,7 @@
 	unsigned long mem_size, rnd_mem_size, pteg_count;
 
 	/* If hash size isn't already provided by the platform, we try to
-	 * retreive it from the device-tree. If it's not there neither, we
+	 * retrieve it from the device-tree. If it's not there neither, we
 	 * calculate it now based on the total RAM size
 	 */
 	if (ppc64_pft_size == 0)