CLEANUP: Fix a typo in the base64 subsystem

Fixes a typo in the code comments of the base64 subsystem.
diff --git a/src/base64.c b/src/base64.c
index 594ab45..f7961c5 100644
--- a/src/base64.c
+++ b/src/base64.c
@@ -99,7 +99,7 @@
 		if (b < 0)
 			return -1;
 
-		/* padding has to be continous */
+		/* padding has to be continuous */
 		if (pad && b != B64PADV)
 			return -1;