coverity fix - 1.1beta branch - add some comments to indicate false positives by coverity for future reference - mainly comments for switch statement fall through

src/app-layer-dcerpc-udp.c

@@ -118,6 +118,9 @@ static int DCERPCUDPParseHeader(Flow *f, void *dcerpcudp_state,
 	if (input_len) {
 		switch (sstate->bytesprocessed) {
 		case 0:
+            // fallthrough
+            /* above statement to prevent coverity FPs from the switch
+             * fall through */
 			if (input_len >= DCERPC_UDP_HDR_LEN) {
 				sstate->dcerpc.dcerpchdrudp.rpc_vers = *p;
 				if (sstate->dcerpc.dcerpchdrudp.rpc_vers != 4) {
@@ -257,6 +260,8 @@ static int DCERPCUDPParseHeader(Flow *f, void *dcerpcudp_state,
 				}
 				if (!(--input_len))
 					break;
+                /* We fall through to the next case if we still have input.
+                 * Same applies for other cases as well */
 			}
 		case 1:
 			sstate->dcerpc.dcerpchdrudp.type = *(p++);

src/app-layer-smb.c

@@ -835,6 +835,9 @@ static int SMBParseHeader(Flow *f, void *smb_state,
     if (input_len > 0) {
         switch (sstate->bytesprocessed) {
             case 4:
+                // fallthrough
+                /* above statement to prevent coverity FPs from the switch
+                 * fall through */
                 if (input_len >= SMB_HDR_LEN) {
                     if (SCMemcmp(p, "\xff\x53\x4d\x42", 4) != 0) {
                         SCLogDebug("SMB Header did not validate");
@@ -876,6 +879,8 @@ static int SMBParseHeader(Flow *f, void *smb_state,
                     }
                     if (!(--input_len))
                         break;
+                    /* We fall through to the next case if we still have input.
+                     * Same applies for other cases as well */
                 }
             case 5:
                 if (*(p++) != 'S') {

src/app-layer-smb2.c

@@ -101,6 +101,9 @@ static uint32_t SMB2ParseHeader(void *smb2_state, AppLayerParserState *pstate,
     if (input_len) {
         switch (sstate->bytesprocessed) {
             case 4:
+                // fallthrough
+                /* above statement to prevent coverity FPs from the switch
+                 * fall through */
                 if (input_len >= SMB2_HDR_LEN) {
                     if (SCMemcmp(p, "\xfe\x53\x4d\x42", 4) != 0) {
                         //printf("SMB2 Header did not validate\n");
@@ -173,7 +176,10 @@ static uint32_t SMB2ParseHeader(void *smb2_state, AppLayerParserState *pstate,
                     //sstate->smb2.protocol[0] = *(p++);
                     if (*(p++) != 0xfe)
                         return 0;
-                    if (!(--input_len)) break;
+                    if (!(--input_len))
+                        break;
+                    /* We fall through to the next case if we still have input.
+                     * Same applies for other cases as well */
                 }
             case 5:
                 //sstate->smb2.protocol[1] = *(p++);