kernel/elf: Fix handling of the commpage in UserSymbolLookup.

We now will find its image struct using the standard iteration,
so just check for its address specifically.

Fixes commpage symbols printing in KDL after the recent refactor.

src/system/kernel/elf.cpp

@@ -1376,20 +1376,19 @@ public:
 		// get the image for the address
 		struct image *image;
 		status_t error = _FindImageAtAddress(address, image);
-		if (error != B_OK) {
+		if (error != B_OK)
+			return error;
+
+		if (image->info.basic_info.text == fTeam->commpage_address) {
 			// commpage requires special treatment since kernel stores symbol
 			// information
-			addr_t commPageAddress = (addr_t)fTeam->commpage_address;
-			if (address >= commPageAddress
-				&& address < commPageAddress + COMMPAGE_SIZE) {
-				if (*_imageName)
-					*_imageName = "commpage";
-				address -= (addr_t)commPageAddress;
-				error = elf_debug_lookup_symbol_address(address, _baseAddress,
-					_symbolName, NULL, _exactMatch);
-				if (_baseAddress)
-					*_baseAddress += (addr_t)fTeam->commpage_address;
-			}
+			if (*_imageName != NULL)
+				*_imageName = "commpage";
+			address -= (addr_t)fTeam->commpage_address;
+			error = elf_debug_lookup_symbol_address(address, _baseAddress,
+				_symbolName, NULL, _exactMatch);
+			if (_baseAddress != NULL)
+				*_baseAddress += (addr_t)fTeam->commpage_address;
 			return error;
 		}