Fix common misspellings and typos

Change-Id: I8152acaccd33a4b646d56cba0748aeefa0c16b35
diff --git a/include/osmocom/rspro/INTEGER.h b/include/osmocom/rspro/INTEGER.h
index e8b36c7..c8edf12 100644
--- a/include/osmocom/rspro/INTEGER.h
+++ b/include/osmocom/rspro/INTEGER.h
@@ -68,8 +68,8 @@
     ASN_STRTOL_ERROR_RANGE = -3,  /* Input outside of numeric range for long type */
     ASN_STRTOL_ERROR_INVAL = -2,  /* Invalid data encountered (e.g., "+-") */
     ASN_STRTOL_EXPECT_MORE = -1,  /* More data expected (e.g. "+") */
-    ASN_STRTOL_OK          =  0,  /* Conversion succeded, number ends at (*end) */
-    ASN_STRTOL_EXTRA_DATA  =  1,  /* Conversion succeded, but the string has extra stuff */
+    ASN_STRTOL_OK          =  0,  /* Conversion succeeded, number ends at (*end) */
+    ASN_STRTOL_EXTRA_DATA  =  1,  /* Conversion succeeded, but the string has extra stuff */
 };
 enum asn_strtol_result_e asn_strtol_lim(const char *str, const char **end, long *l);
 
diff --git a/include/osmocom/rspro/constr_TYPE.h b/include/osmocom/rspro/constr_TYPE.h
index 13c60f3..e244d20 100644
--- a/include/osmocom/rspro/constr_TYPE.h
+++ b/include/osmocom/rspro/constr_TYPE.h
@@ -158,8 +158,8 @@
 typedef struct asn_TYPE_tag2member_s {
 	ber_tlv_tag_t el_tag;	/* Outmost tag of the member */
 	int el_no;		/* Index of the associated member, base 0 */
-	int toff_first;		/* First occurence of the el_tag, relative */
-	int toff_last;		/* Last occurence of the el_tag, relatvie */
+	int toff_first;		/* First occurrence of the el_tag, relative */
+	int toff_last;		/* Last occurrence of the el_tag, relatvie */
 } asn_TYPE_tag2member_t;
 
 /*
diff --git a/include/osmocom/rspro/per_support.h b/include/osmocom/rspro/per_support.h
index 181fe24..ed945ce 100644
--- a/include/osmocom/rspro/per_support.h
+++ b/include/osmocom/rspro/per_support.h
@@ -53,7 +53,7 @@
  */
 int32_t per_get_few_bits(asn_per_data_t *per_data, int get_nbits);
 
-/* Undo the immediately preceeding "get_few_bits" operation */
+/* Undo the immediately preceding "get_few_bits" operation */
 void per_get_undo(asn_per_data_t *per_data, int get_nbits);
 
 /*